A forex trading plan is a written rulebook that removes emotion from your decisions. Start by defining your goals, available capital, and risk tolerance.
Set a hard risk-per-trade limit, commonly 1 to 2% of your account, and decide your overall risk-to-reward target, such as 1:2. Choose which currency pairs and sessions you will trade and the timeframes you will analyze.
Specify your strategy precisely: the exact technical or fundamental conditions for entries, where you will place stop-losses and take-profits, and how you will size positions given leverage. Include rules for managing open trades and for when not to trade.
Add a routine for journaling every trade and reviewing performance regularly. Finally, backtest and demo-test the plan before going live, and commit to following it mechanically rather than improvising.