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

https://erickcmpc682.theglensecret.com/what-is-included-in-an-employee-cost-calculator

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