Keep your first business simple: one product, one place
When I started my side hustle, I wanted to sell everything at once. Tried to have many products, many markets, even tried to build a whole app for it. That was a mess. Best thing I did was to cut down to one product, one place to sell it, and one way to get paid. For me that was selling tomatoes at the local market and taking M-Pesa payments. Once that worked, I learned slowly and added more. So my tip is: start small. Pick one thing, sell it in one spot, see what happens. It sounds basic but it saves you a lot of confusion.