Welcome Alex.

Step 1 write down exactly what you want to accomplish
Step 2 Keep coming here for help
Step 3 Prepare to become addicted to scripting.

As to your questions.

I am a believer in no visible trace of the logon script. The users don't pay attention and they will think you are magician when it all just works.

As for mapping drives are there any qualifications of who gets what, or is everyone the same no matter what?

What about error logging?

As for installation of the program, you will only need to copy the Kix32.EXE and the WKix32.EXE to your netlogon share.

Once you have the script complete you will place it in your netlogon share as well and for each user, you will specifiy the logon script as "kix32.exe logon.kix" and you are done.
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Today is the tomorrow you worried about yesterday.