What specific needs are you addressing in your business plan?
I think traditional business plans can be dangerous and I personally don’t use them. Many people tend to use business plans as a method of procrastination (i.e. it’s easy to just write down the plan than to actually execute it). Traditional business plans tend to be massive with a lot of predictions and can become intimidating to execute.
With that said, I think you should just plan out the next week or month of your business. Set a goal and write a small strategy of how you are going to achieve it. Then, start executing the next day.