MACD Strategy

This script sends buy and sell signals as alerts to 3Commas (online software with trading bots in cryptocurreny)

It's based on 2 indicators:
- MACD
- 12 EMA and 26 EMA
When the 12 EMA and 26 EMA crossover, the MACD line crosses above 0. The goal here is to look for buy signals when the MACD and Signal are below 0, the histogram is positive, and there was or will be a 12 EMA and 26 EMA crossover.

I struggle with the following:
- There are multiple ways to use this as a crossover signal. I want to calculate the win rate of every posibility.
- What should be my take profit and my stoploss?

I think a 2:1 R/R,and a 60% win rate would make a great strategy! I could use some advice.