I'm 14. How would I begin training for the future Olympics?

I am 14 and have been doing Tae Kwon Do since I was 8. My karate instructor has asked me to do several competitions ever since I started because I have a strong natural ability for it. I have not gone to a real competition yet, but plan on doing atleast one this summer. I have been taking karate for 6 years and I am an advanced blue belt, going on red belt. But I am confused on what I will do next? I plan to continue taking karate until I get my black belt. But how many degrees of a black belt do I need to be in the Olympics. That is my dream! What are all the qualifications for getting into the Martial Arts in the Olympics? Also, when would I start training for it and how would I train for it? Help please?!