We had come out a system. Backtest shows that the system can predict the direction of market movement correctly in 60% of time. (It is a system to predict if market will go up or down, but not how much). We believe that 60% correct predict ratio shall maintain in future. Given these information, 1. What percentage of capital shall we bet each time ? 2. How to set stop-loss ? 3. How much leverage shall we use ? Thanks.