Long thread, but here are my ideas:
Over the past 10 years or so I have blown out three times, and I am now have a profitable system.
Here are some suggestions:
1. Start small, 5K or less.
2. One or two contracts for at least six months.
3. In the beginning, forget about profits but learning the craft. Simple mechanics of getting in and out of a trade.
4. Read Van Tharp's book and develop a system. Use those six months to refine and get experience in using your system.
5. After a few months (probably losing money), start refining the system so that you can break even. First learn the system before worrying about profit.
6. The most important aspect of trading is not the entrance but exits -- limit losses and take profits. Include exit rules in your plan. Learn when to get out of a trade.
Probably the biggest breakthru in my system is figuring when and how to adjust (exit) my position. This made a major difference in my profitablity.
NOTE: I trade options so this may not apply to you.