It should include anything you consider useful and important for achieving your trading objectives.
Make sure your plan covers the following: timeframe you’ll be trading on
(M1, M15, M30, 4H, Daily, Weekly, Monthly, etc.), trading session (Sydney, Tokyo, London, and New York),
available capital for conducting trading operations, risk management techniques,
trading strategy, period of time you’re ready to dedicate to trading, goals, exit and entry rules.