Here's my advice list:
1. Buy the
Yamaha Sound Reinforcement Handbook and treat it as the Audio Bible.
2. After reading that, remind yourself that you DON'T KNOW EVERYTHING. If you forget that fact, you will be reminded (gently or not-so-gently) of it when you stick your
foot in your mouth.
3. Remember that there are no stupid questions, only stupid people.
4. Do whatever you can to get involved in the industry - talk to local companies and see if they need extra hands to coil cables and move gear. You will almost certainly NOT get to mix anytime soon, so learn to lift properly and how that company likes their cables coiled.
5. Experiment with your knowledge - that is the best way to see what works and what doesn't. Then, afterwards, go back and read the theories behind what you were doing. Get to know the how's, why's, and when's of the industry.
6. Learn that more-often-than-not, any specific questions you have about a
system, room, or equipment will be met with a response of, "it depends".
7. Don't be a push-over. Be willing to do things, but don't let people use you as their doormat. (see my signature quote)
Never stop learning, always ask questions, and realize you are not God's gift to the world (not saying you actually feel that way, mind you). Good luck!