Backingup Database using SQL script

Hello,
Let me start by saying I am new to Oracle, and I am trying to learn how to do a project where I must write an SQL script that can be used to back-up all the database files (i.e. control, redo log, and data files). Assuming that all of the files are stored in one folder, the source and destination locations of these files must be provided as "substitution variables". The script must implement the following tasks (directions)
Connect as user SYS with SYSDBA role
Shutdown the database
Copy the database files from the source location and store in the destination location
Restart the database
Connect as user SCOTT
In addition the script must use the "HOST" command to issue the operating system command to perform the copy task.
*Since this is just a learning project, and not a real scenario, I cannot run my script in SQLplus to verify if it is correct. This is why I am asking for some professional advice. I am currently working with Oracle 11g Enterprise running on a client Windows XP OS.
Below is what I have determined is a cold backup, please let me know if what I am doing is correct so far, and if not can you please steer me in the right direction.
connect SYS/<password> as SYSDBA
shutdown;
HOST copy from &source_file to &destination_file; --this is the line that is confusing me.
connect SYS/<password> as SYSDBA
startup;
connect scott/tiger
thank you in advance for your time and input.

Thank you Brian and Frank. I agree with you that RMAN is the best way to perform a backup (from what I have read over the last week or so) in a production scenario., especially if the DB needs 24/7 access. Also , thank you Brian for the helpful links.
I currently have the free Oracle Enterprise 11g edition downloaded to my computer, running on VB with client Windows XP OS. But being new at this I find myself scared of running bad script that may break down my DB. I know I can just reload it and start over, but I am trying to approach this as carefully as possible. Although, the error codes help me understand what I am doing wrong a lot of the time.
Also, thank you Frank for the shutdown immediate advice. I also like the idea of writing/saving data to the spool for future reference that will definitely come in hand down the road. I didn't think about writing a .bat file to run via SQL*Plus, that would also be a great alternative.
Continuing with the hypothetical scenario that I need to perform a very basic cold backup that requires a shutdown (with archive logging off) and a restart, do you think this script would run error free. Also, assuming the substitute variables are actual paths to where the whole of the database files are stored and their new destination file actually exists.
--Windows XP OS
connect SYS/<password> as SYSDBA
shutdown IMMEDIATE;
HOST copy &source_file &destination_file
connect SYS/<password> as SYSDBA
startup;
connect scott/tiger
Thank you again for your time and patience.
I find myself learning more from asking questions to professionals on this site than from my own professors.

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