How to create a page with LOV and a Go Button that calls a sproc

I'm new to Apex but not Oracle. I've done some VB, C and other programming.
I have read the 2 Day + and worked through most of the advanced tutorials as well as the Apex 3.0 ermployee task OBE. I'm looks for an OBE or assistance in doing the following:
I need to create a page that has a dynamic LOV that pulls CUSTOMER NAME as d, and ID as r (this I can do).
I need a button on the page "Go". Here's the use case.
User selects a customer from the LOV
User presses Go
Go invokes myschema.go_sproc and passes in LOV selected Cust ID
myschema.go_sproc does some work and passes back a Status
Status is displayed to the user
Any pointers are appreciated.

Great.
Two last questions:
#1 Is there a Apex Reference, like the SQL Reference, that lists all the various settings and options and their meanings, for instance on the create region page there are many different region types. Is this information centralized in one place? I don't see (or I am missing it) in the list of Apex 3.2 books.
#2 For my use case would you use a HTML region or some other type of region?
Thanks again.
George

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