>>1831761Im assuming you mean backpacking and not glamping (not that there's anything wrong with that)
Download Alltrails and find a place with primitive camp sites.
Find a spot nearby and start camping on the trail one night within like a mile of your car. The point of this is that you can't really fuck up too bad, but you're also far enough away that you won't depend on the extra food, water and clothing you pack in your car before you go unless it gets bad.
You can check to see if there's an REI nearby that will rent gear if you want to try the major stuff out before sinking a bunch of money buying.
I prefer packs sized 35-40 (sometimes marked 3500-4000) with internal frame for overnight trips, but you're not going to find out which size fits your style unless you go out and do it. Some people prefer to pack in all kinds of creature comforts and some don't.
Your tent is one of the biggest opportunities to save weight, and it will make a difference on a long hike.
Temperature is going to impact a lot of your gear choices, so just make sure things are right for the Temps, remembering that even in July in Georgia I've been chilly at night at elevation when I didn't bring a sleeping bag.
Keep iodine tablets handy all the time.
Cotton balls massaged with Vaseline is good packable tinder.
Just do your best and keep a notebook of the things that worked and the things that didn't. Figuring it out is half the fun if you're not in everest or something.