How to search files, get cells, loop, and save

Question

Howdy Folks, I'm another Applescript newbie in over my head. I'm working on a script to copy xl files into a master xl file. the files is a roster with student and class information. the number of students will vary. WIth help from a friend I have it about 80% where I want it. Need help with the rest. I hope its okay to ask multiple question about the script if not i do apoligize.
when the script runs it asks for the location of the file. the files are titled Houston_Sam_DWI_Jan.xlsx. I have several files in a master folder that i am trying to get data from, but the script goes through one at a time.
I know i need to loop it somehow to go through all of the files containing "DWI" in the title, I just don't know how to do it.
the script is set up to get a range of cells, but there are other individual cells i need to copy like dates(C7), Instructor(H7), and location(C11). How do i get these individual cells and paste them to the master doc: Location(E7), Dates (F7), Instructor(G7) and have them repeat down the column as the number of students from each of the classes populates the list.
finally, i have the master file name as annual report, the script does update the anual report file, but when it goes to save it creates a file named "sheet 1". i just want it to update the annual report file and save all changes.
here is the script i am currently working with:
set master_path to alias "Users:bs:Desktop:master:Annual Report.xlsx"
get_all_files(master_path)
on get_all_files(master_path)
          set example_path to choose file with prompt "Find an example file to work with"
transfer_data(example_path, master_path)
end get_all_files
on transfer_data(child_path, master_path)
          tell application "Microsoft Excel"
                    set child_book to (open workbook workbook file name (child_path as string))
                    set child_doc to worksheet 1 of child_book
                    set master to worksheet 1 of (open workbook workbook file name (master_path as string))
                    set num to 15 --All lists start at index 12 or later, I'm putting 10 to be safe
                    set students to {}
                    tell child_doc --grab values from child document
                              repeat until (value of cell (("A" & num) as string)) is 1
                                        set num to num + 1
                              end repeat
                              repeat until (value of cell (("B" & num) as string)) is ""
                                        set end of students to {name:(value of cell (("B" & num) as string)), driver_id:(value of cell (("C" & num) as string)), DOB:(value of cell (("D" & num) as string)), pre_test:(value of cell (("J" & num) as string)), post_test:(value of cell (("K" & num) as string)), cert_id:(value of cell (("L" & num) as string))}
                                        set num to num + 1
                              end repeat
                    end tell
                    tell master
                              set num to 7
                              log (value of cell (("B" & num) as string))
                              repeat until (value of cell (("B" & num) as string)) is ""
                                        set num to num + 1
                              end repeat
                              repeat with student in students
                                        set value of cell (("B" & num) as string) to name of student
                                        set value of cell (("C" & num) as string) to driver_id of student
                                        set value of cell (("D" & num) as string) to DOB of student
                                        set value of cell (("H" & num) as string) to pre_test of student
                                        set value of cell (("I" & num) as string) to post_test of student
                                        set value of cell (("J" & num) as string) to cert_id of student
                                        set num to num + 1
                              end repeat
  save master
                    end tell
  save child_book
  close child_book
  save active workbook in master_path
  close active workbook
          end tell
end transfer_data
Any help would be greatly appreciated.

Answer 1

That did it. had to tinker with it but it's doing what i want. Thanks for all of the help. here is the final code
tell application "Finder"
          set master_path to alias "Users:bs:Desktop:master:Annual Report.xlsx"
          set filesWithDWI to get every file of folder ((path to desktop folder) & "master" as string) whose name contains "DWI"
          repeat with f in filesWithDWI
                    my transfer_data(f, master_path)
          end repeat
end tell
on processfile(f)
display dialog f as string
end processfile
on transfer_data(child_path, master_path)
          tell application "Microsoft Excel"
                    set child_book to (open workbook workbook file name (child_path as string))
                    set child_doc to worksheet 1 of child_book
                    set master to worksheet "sheet 1" of (open workbook workbook file name (master_path as string))
                    set num to 15 --All lists start at index 12 or later, I'm putting 10 to be safe
                    set students to {}
                    tell child_doc --grab values from child document
                              repeat until (value of cell (("A" & num) as string)) is 1
                                        set num to num + 1
                              end repeat
                              repeat until (value of cell (("B" & num) as string)) is ""
                                        set end of students to {namevalue of cell (("B" & num) as string)), driver_idvalue of cell (("C" & num) as string)), DOBvalue of cell (("D" & num) as string)), pre_testvalue of cell (("J" & num) as string)), post_testvalue of cell (("K" & num) as string)), cert_idvalue of cell (("L" & num) as string))}
                                        set num to num + 1
                              end repeat
                              set startdate to range "C7"
                              set classlocation to range "C11"
                              set instructor to range "H7"
                    end tell
                    tell master
                              set num to 7
                              log (value of cell (("B" & num) as string))
                              repeat until (value of cell (("B" & num) as string)) is ""
                                        set num to num + 1
                              end repeat
                              repeat with student in students
                                        set value of cell (("B" & num) as string) to name of student
                                        set value of cell (("C" & num) as string) to driver_id of student
                                        set value of cell (("D" & num) as string) to DOB of student
                                        set value of cell (("H" & num) as string) to pre_test of student
                                        set value of cell (("I" & num) as string) to post_test of student
                                        set value of cell (("J" & num) as string) to cert_id of student
                                        set value of cell (("f" & num) as string) to startdate
                                        set value of cell (("E" & num) as string) to classlocation
                                        set value of cell (("G" & num) as string) to instructor
                                        set num to num + 1
                              end repeat
                    end tell
  save child_book
  close child_book
  save active workbook in master_path
  close active workbook
          end tell
end transfer_data