Roger
Welcome to MT
I commend you for wanting to kick the drug habit and make something of your life. However it is my belief that the hardest fight is going to be staying sober and clean when your body is pounded, your mood is down, you've had a tough day, a fight with the wife or kids, you lost a match or took a beating in the ring. It is then that you will see if you have taken back a part of your life that was given away to drugs. I believe you need something more to hold onto then just your fighting ability or your chance to become a fighter and win some self respect. Get back your self respect outside of the ring by controlling your life, or your life style, train hard and no matter what; win, lose, or draw you have become a better person not just a good fighter.
Look your in your early 30's as a competitive fighter you might not really have a lot of time, even if you do and succeed beyond your wildest wishes if you can't handle the fame, the pressure, the life style outside of the ring, you will crash and burn in both places. Master your life outside of the ring, outside of the martial arts, and you can win in both places; but even if you fail in the ring you can still win in life. Any sport takes a toll on your body or your soul, check out "The Armstrong Lie" to see a person who lost his soul in a sense to the sport. Lance was on top of the world physically in bike racing, a cancer survivor, a hero to caner patients. Still he had to cheat, lie, and discredit anyone in his way and ultimately his pride took him down. Check out "The Smashing Machine" (a documentary) to see a wrestler turned MMA star go down the dark side of drugs and pain killers. Both great athletes in top form but couldn't or I should say had a hard time managing life outside of the sport.
Sometimes I think we as martial artists (myself included) tend to believe if only I achieved this or that, earned this rank, fought this fight, etc. etc. than I would feel better about myself. When we need to accept where we are and do the best we can as we move forward in life, not try and live in the glory days of old. I had a friend who wanted to do something special for his 6th or 7th dan test; he tells me that he wanted to do a flying side kick board break. Problem was he had a bad back, he was a caner survivor, bad knees, and had other health issues as well. I mean he was in no shape to do some flying board break and for what? It wasn't required, no one told him he needed to etc. etc. he wanted to do some break to prove to others and himself that he still was/is a good martial artist. However what really proved he was a good martial artist or a good teacher was the quality of his students and his life not a broken board.
I commend you for wanting to take back your life and for taking the steps to do just that, and I apologize if I seem harsh, I don't mean to be. MT is a great place to meet other martial artists and to talk about things MA related. I believe what I said here is like practicing basics in a martial arts. If you have a weak foundation than the rest of the art will be weak no matter how good your skill level. If you can't master your life outside of the ring then inside of the ring will be weak as well.