I have a belief (and of course others may have different beliefs and therefore disagree with this) that all parts of a trading strategy need to be linked and worked out before a trade with real money is placed.
A minimum checklist for me would be to establish
1 Beliefs assumptions and logic of the trading edge you believe you have found
2 Set up criteria and filters
4 Entry techniques
5 Initial stop definition and potential reward
5 Bet size / position sizing algorithm
6 Exit techniques
7 Re entry techniques
8 Rules for bets in combination.