I'll answer these for you
I would like to join the ang to fly? - At least you are aware of the ANG. Think of all the guys that are Stop-Lossed that wished they knew about the ANG before they joined active duty.
Can I fly if I am still in college? - No. That was the old days. Not any more. You can always fly on your own.
What is basic training like? - It depends...if it's AMS, a cake walk, if it's Parris Island, hell. (AMS is the Air National Guard's 4 week OTS)
Could I be a navigator in the ang? - No, unless you want to look for a job in a few years. Navigators went out back in the days of Chris Columbus and the F-4. In the Navy they call Navigators NFOs, short for No Future Outside. Hence many a boat Captain are former NFOs.
What do you have to do medically before you go? - Have that foot problem looked at! What do you think, you have to pass physical. Don't get that lazer eye surgery.
If I answer the rest I'll become even more cynical. You can learn about the ANG on there web site.
This will be your first test. Find the web site without asking.