There are two main styles of entry:
Entry immediately without waiting for the closing of the price bar (aggressive operators).
Wait for the price bar closed and then enter the transaction with the next bar if conditions have not changed and remains valid signal (more conservative approach)
For outputs, you can set an amount you want to win for the operation, or use tools that help to set profit targets (Fibonacci, Pivot Points, etc), or use trailing stops.
Calculate the risk on each trade
It is essential to know the risks and potential rewards of each operation. The logical thing would be entered only if the risks are at least two times lower than the potential gains. For this, you must first define the level / point in which close the position if it becomes a loser, using appropriate indicators.
Test the system to see if it works
Before implementing the system, it is advisable to open a demo account with a broker and try to evaluate their effectiveness. Ideally, use this account to practice for three or four months to be sure that we have become familiar, as it Forex market is very volatile and their behavior can vary dramatically in certain periods.