First tip without trying to come across as a smartass...
Make time to go to school and get a degree. The chances of making enough of an income to support yourself, much less a family, plan for retirement, etc.. in this sport are very, very little from a statistical standpoint.
Chase your dreams, but also plan for the future and build a safety net for the unexpected. There are alot of unplanned things that can happen in life, some good, some bad.
That is probably the best advice anyone can give you. As for the more practical tips, here are 3 obvious ones:
1. A fight is won on the training ground. You don't win a fight because you're 'talented', you win it by practicing hours and hours.
2. Stay humble. Even though you train with a starter, you can learn something from anyone, anywhere at any time.
3. Make your homework before a fight: know you opponent. What is his background? did he practice another martial arts before MMA? What are his favourite techniques? What are his weaknesses?
I know it's basic, but in my opinion these things are most important... (After getting a degree and a backup plan)
Hope it's useful!