To make a trading plan in forex trading, start by defining your goals, risk tolerance, and preferred trading style. Next, identify the currency pairs you want to trade and develop a strategy for each one based on technical and fundamental analysis. Set entry and exit rules, including stop-loss and take-profit levels, and determine the size of each trade. Regularly review and update your trading plan based on market conditions and your performance. Stick to your plan and maintain discipline to maximize your chances of success in forex trading.