Have a look at the ARRL web site first.
If your interest is HAM for off-road and trial use, start searching the web for info on Amateur 2 meter mobile radios. These radios are what is commonly used for local communications and trail groups, they operate at 144-148 MHz, aka VHF, aka 2m band. They generally resemble a truckers CB radio only they are a lot more clear, useful and powerful. The first licence class which covers 2m and a ton of other bandwidth is called Technician, so google it up as well, that's what you will want to pursue first.
I studied with Ham Test Online at
www.hamradiolicenseexam.com, it's a subscription service but you will learn a good deal and ace the Technician test if you study there and take the test when they tell you you're ready. A 2yr subscription is like $25, seems to me that about 20 hours of study would get you there easily. Learning morse code is no longer required for a HAM license.
Overall I have found HAM's to be a pretty helpful bunch of DIY'ers. I only got my call sign last week.
Looking at what is available at the online HAM retailers will give you a lot to think about as well. It's a pretty broad hobby and you have to figure out what you want to do with it.
Good Luck,