A trading plan is a must. I would be will to bet that virtually all successful traders have one. However, most new traders have no plan. In fact, I bet most new traders barely even have actual reasons for entering a trade. Imagine that you are planning to loan money to a new business as an investment. Could you picture yourself lending money to this person if they had no business plan and said they were going to start their business based on "their gut"? Of course a person would never be able to start a business by relying only on their gut. However, plenty of new traders start trading in exactly that manner.
Creating a trading plan is actually relatively easy. There are several core requirements that make up the plan. In my opinion, the main components of a trading plan are: