Hello Ricky, and Welcome to LRH.
You've opened a big can of worms, because the options are limitless
I believe there are praire dogs in Kansas, Nebraska, South Dakota, Colorado, Wyoming, Utah and Montana. There might even be some in other states that I don't know of. I am guessing that WY, CO, SD, and MT are probably the most populated with PD's, but that is a guess.
Some guys make their own bench's, others use folding tables, some buy pre-made benches, some shoot off a bipod prone in the dirt, others shoot off the hood of pickup trucks, and others build elaborate benches mounted to trailers with umbrella's, beer kegs and BBQ's attached, again the options are limitless.
Rifles that work best
are highly accurate, not picky about ammo, not cold/heat sensitive, and shoot good even with dirty barrels. They usually resemble a benchrest gun, more often called varmint guns........the heavier the better. Something from 204 Ruger to 25-06....lots of choices in between. If you find a good town that's fairly fresh, you'll shoot alot of ammo pretty quick.....so cost of ammo and components is a consideration for some. Low recoil is a consideration for most.
You'll probably want a scope that magnifies at least 10X, 14-18X works great, 20-24X is ok so long at the heat waves and mirage aren't too bad.
You can spend as much as you want on rests and bags, but you don't necessarily have to. You can fill some shot bags with sand and shoot your barrel out just as fast as the guys with $1000 pedestal rests.
Take sunscreen, bug juice, plenty of water and ammo. Don't forget the cleaning rods/solvents, ect. Binoculars are a big help IMO.
We could discuss this subject for hours and hours.
The Varmint Hunters Association is a good reference/magazine if you'd like to get really serious about it. I've been a member there since the early 90's.