Set your rules/plans based on your past experiences, bend it based upon your current feedback and observations as situation demands, and break rules based on what's not working
Your business plan should not try to be one-size-fits-all. However, it is important to understand the different perspectives with which people will read your plan.
Having a backbone of support mentorship can be useful for entrepreneurs when it comes to steering the business from the infancy level to a profit-turning one.