ArcGIS

Follow this link to get set up with ArcGIS on your computer. GINA Esri License Program

If you're unsure of your next course of action here's another helpful page about the current GI contact person for ArcGIS: Renewal Notice Page

Basically, if you want to install Arc you can download it off that website and then you'll need to send the GI an account number to bill the software license to. They will also probably give you a USB dongle for your computer.

Searching the internet is probably the best approach for questions. Good luck with that. Some more specific resources include the ESRI website, ESRI Email List-serve subscription page, and The Google.