I started shooting skeet in high school to get better on the dove fields and better at quail shots. I always started at a low gun position to practice that hunting scenario and still shoot skeet like that today. Skeet is the best thing I EVER did to hone my hunting shooting skills for in the field! Learn it, shoot it, and you'll love it. Trap will come easy to you after that. Sporting Clays...yes and no...depends on how difficult the course you shoot. lol
Trap: I usually shoot Mod. for 16 yd.
Sporting Clays: I find myself shooting Skeet bottom barrel & Mod. top barrel a lot. But I will change it up depending on the circumstances. Single barrel gun, Mod. is a good overall choice...if nothing else, you should get better over time and when you switch to IMP or skeet choke it'll seem like shooting fish in a barrel.