I run 800-3200, and I'm doing full body lifting 3x a week. What exercises should I do, how many sets, and how many reps. Personally, I'd like to do bench, lat pull down, bicep curl, tricep extension, leg press, leg curl, and leg extension. Would just 1 set until faiure suffice?
You shouldn't be doing bench and curls.
I'd say do Squats, Deadlifts, and Power Cleans if you want to work yourself all over. There is a reason they are the Olympic Lifts.
Focus on doing body weight core exercises, with big, compound movement lifts. Not because this is necessarily the best way to train, but (so long as you have someone teach you proper form) it is by far the simplest. For a Junior in High School, that will be more than enough.
Let me qualify everything I just said as mostly opinion and what I've seen work well in my personal experience. An expert like Runningart might be able to go next level on that sort of stuff.