1. Start Small. Be very prudent with margins. Anything above 10:1 is too high when starting out, imo. Try to trade with cash if you can. Once you start to become more profitable, you may trade with higher margins. CFTC has set the margin ceiling in Spot Forex to be 50:1, on par with futures and that should be the maximum margin for any traders for all financial instruments no matter how large your financial capital imo. If Bill Hwang can't handle 600% margin with $100 billion assets, neither can you.
2. Backtest, backtest, and backtest more
3. Do NOT trade until the strategy is at least 6 months, preferably a year profitable in backtesting
4. Be prepared to lose and lose BIG
5. In Forex, watch out for market-making brokers that trade against you. Try to sign up with brokers that charge a commission and with tight spreads that do not have outrageous margin policies. Anything above 100:1, chances are the broker is a market-making broker and is trying to entice you to trade bigger in order to profit more from you.