Find a system that produces a good WFA or at least one OOS run (70/30).
Then run a monte carlo simulation with the OOS results you got to determine the equity requirement to trade the strategy safely (I always want the risk of ruin to be less then 10% within the first year).
Then run this system a few months on demo to see if it does there the same as it did in backtest. If after a few months the demo results are consistent with the backtest you are good to go to start live trading.
