Infracstructure upgrade

Hmm. Before you can write any questions, you will need to decide what the aim of your questionnaire will be. What information to you want to collect? What are you trying to achieve?

Slick!!! Exam 70-219 Designing a Windows Directory Services Infrastructure. Get your hands on one of the self paced training kits from microsoft. they come with a CD which has ALL the questionaires you'll need in designing your network.

you could also just do an Internet search keyword Design Directory Services forms. never know who posted what.

Novell!
Netware is a good solution for mixed environments (by the way, even if you have only M$-Windows XP still Netware is a better solution than M$ for the server).
Do you want to use Linux? go ahead, but Novell NDS will help you to easier management. Take a look a SUSE Linux (Novell again).
Hope this help.
Pablo.-

First, You need to know on how much computing power that you need. So you can decide which of the 4 Penthium 4's that you need to gear-up to be your Primary Server and or as well as your File Server and connect the remaining Computers. Next is knowing what OS that you want to install in your PDC (Primary Domain Server). Next would be Setting up the Mac G4's (Setting the shared directory from the PDC, from where your Mac's extract share information OS to OS). Next probably is setting your internet connection.