I’d start with the SBA’s free business-plan guide if you’re turning an idea...

https://brookspiou157.bearsfanteamshop.com/is-american-business-center-free-to-use-with-no-signup

I’d start with the SBA’s free business-plan guide if you’re turning an idea into a workable plan. It walks through market research, costs, and financial projections, so you can spot gaps before you spend money or take the plan to a lender