Some of the best tips:
1. Dont rush it. Take your time and gradually work your way up.
2. Setup your bike properly. Lower air pressure, good broke in tire etc...
3. Dont panick. This is the biggest reasons why new riders crash. They panick when in a wheelie and dont let off the throttle. Watch any crash were they go backwards all they had to do was let off the throttle and it would have set down. And in the cases where they were to far gone to let it down. they were skipping tip #1.
4. And dont stunt on a public road. Cars dont see bikes. Be aware of your surroundings at all times.