Home training for MMA? Help me decide?

ive been training for fighting for years, im 15 years old 5'7 and 200lbs, i have very little fat on my body. i need advice on how to train for mma. i have a full gym and heavy bag. i currently dont take classes but im joining soon. i need to know the best way to train. and what i should train in, im a brown belt in kenpo karate. what would be the best class to take in addition to regular kickboxing?(kenpo, jujitzu, exct.)