I'm a great believer in writing out a business plan with any new business. Do the research and the financial plan and everything else will fall into place. Sorry it's difficult to be more specific as I don't know the details of the business. Each business will have its own concerns, highs and lows.
I agree that clarity of vision, goals and a smart and strategic action plan are all important. Contacts are fundamental too (although you will forever be building on this).
Most of the Mumpreneurs that I coach face challenges with overwhelm because running a business involves multiple projects just as running a home does. And another major challenge is a fearful relationship with money.
With these combined, it is easy for Mumpreneurs to slip into a state of doubt, self-judgement, etc...
While I help them with the business vision, action plan, tools, strategies etc... equal energy and time is spent supporting their clarity of mind, self-confidence and self-care.
Smart and strategic business start-up and growth requires clarity of mind, confidence - a strong and unwavering belief that THIS IS GOING TO HAPPEN.