Congrats and welcome to the Madness.
Usually it is better to study your subject before you dive in head first. That didn't happen so let's work with what we have.
DO NOT DRIVE the truck until you check the brakes and become familiar with the systems.
The first step is to download the Technical Manuals. Start with the TM 9-2320-361-10 Operators Manual.
TM 9-2320-361-10
It will tell you the basics of how to operate your truck.
Second. Ask yourself what you want to do with the truck. That will dictate what type of insurance you will want. There is everything from cheap "parade" coverage all the way to commercial.
Almost every question you will have has been asked and answered countless times.
ADVANCED Search will become your new best friend.
Start reading the Deuce Wiki, any stickies and then search for the subject you are looking for.
Third. What are your mechanical skills and will you do the work or have someone else do it. There are few shops that will work on Deuces. And you don't want to pay them to learn. You may not have the skill set but you can learn it very quickly. Oh and I almost forgot.......