Since you're driving in vs. backpacking in, you'll save a lot of money on camping gear. For 2 days, I'd recommend a propane lantern, and a propane burner/cooktop thing. Big enough for 1 pan & screw to the top of the propane tank. 2 tanks of propane. Bring a cooler with awesome food, especially a great big t-bone for dinner, and a pound of bacon for breakfast.
Take the top rack out of your grill at home, use that for over a campfire (prop it on rocks.) Bring whatever pots/pans you'd need from home. Paper plates, etc., that you can toss into your fire when done using. 2 days? 12 pack of your favorite beer. A case of beer if you think you might make some new friends at the state park. A relatively cheap tent is fine. You don't necessarily need a sleeping bag; a couple of old blankets from home are fine. Get one of those eggshell mattress topper things though to fold & put underneath you, else some other type of mat or blow-up mattress. And, bring a real pillow that you like. If you were backpacking in, things like the pillow would suck. Bring a bunch of rope. You'll never know when you need it (hanging the lantern from a tree, holding up the cheap tent, etc.) As far as the tent goes, the simpler the set-up, the better, especially since no one is going to help you. A lot of them are really simple - 3 poles that are bungie corded together - slide through the slots, tie the top center of the tent where they cross, insert each end of a pole into a reinforced tab (or a metal pin holds each end). 3 minutes to set one of those tents up. Radio. Camera.
State Park? You can probably get away with decent sneakers that are comfortable. Then again, I'm more of a sneakers person as long as the ground isn't muddy or covered in snow.
Slowly ease yourself into camping by getting just a little new equipment each time you go out. After a short amount of time, you'll think "I wish I had..." and that will better guide you than any list we could make up. But, a warning, it doesn't take long before you've spent thousands of dollars

"I wish I had a camper instead of this tent." "I wish I had a canoe." "I wish I had a small boat." "I wish I had a bigger boat" "I wish I had a fish finder" "I wish I had a fish finder with GPS and maps loaded into it of the lake and the bottom contours." It never ends.