More businesses grow out of business than go out of business. Build in extra time and flexibility as you plan for the future. It will probably take longer and more money than you think.
It is an inconvenient truth that you often need cash flow to borrow money to help with cash flow. A circular argument for sure! Break the circular argument. Get your cash flow from customers and suppliers. Get up-front deposits and accept credit cards. Then you can borrow money for things like inventory, equipment, and hiring.