For my 3 1/3 cents take an each way bet.
Start with a 1-2 page business plan in bullet point with three sections;
1 What I need to start:
Licences, insurance, and other essentials.
2 What I need to do very quickly In the first few months:
Small batches, trial marketing, trade shows, pricing, paypal, credit card facilities etc
3 What I need to improve in the long term once I have established:
Staffing, procedures, new developments in product/ marketing, selling into chains, moving out of the home office, branding PR etc.
Initially I would think, do, review; that is think of something to start or improve, try it on a small scale then review what happened if it works, keep going and think of ways to improve it , if it doesn’t live up to expectations then learn from it and think of a new approach and repeat the cycle building up as you go.
Regards
J