Setup1 changes (installation changes)

I am a new VB programmer (self taught). I have been looking at the Setup1.vbp to see if I can change a couple of things, but I am not having much luck with getting what I need accomplished. Does anyone know of a site with examples of setup1 changes?

What I need is

1. The directory where the files are to be copied changes with the customer. I want to pop up a box ask for cust number(got this done) and for certain files I need the directory to be c:\pdp\pdp'CustNo'\win. I know the files that will go here, but I have no idea where in the setup rountine to check for these and change the destination directory

2. Look for a file and if it is present only copy part of the files included in the setup(my program will be used as conversion as well as a new install, so in some cases I need old files saved)

3. Put an icon on the desktop. I have code for this, but I am not sure where in the setup routine I should place it.

Thanks in advance for any help.

Catrina