Welcome to myGMRS.com.
In one sense GMRS is quite simple, yet you can take it to quite an extreme. And some people do.
Your budget will determine a lot about what kind of radios you buy.
I would start with a couple of HTs to get your feet wet.
GMRS is in the UHF band so don't expect to get the distances you hear by hams doing HF. Trees, terrain, etc. will affect your distance. It could be anywhere from 1/2 mile to 50 miles or more. Do your own testing in your area of operation to find out what's real for you.
"Privacy Tones" aren't private. Others can still hear you, you just can't hear them unless they transmit with the same tone.
Repeaters typically use tones to operate.
These are just some basics to help you get started.
@OffRoaderX has some good videos to help you get started.
As you come up with more specific questions, feel free to ask.
Also, you can do a search to find questions that have already been answered.
73
Edit:
I forgot to mention, @marcspaz did a real good video on intro to GMRS.