Start by developing ideas. Brainstorm. What are my obstacles? What are the chances I’ll run into any?
Get support from people around you. Ask any close friends or family if they know anything about whatever your selling.
Look at trends in products and make sure your selling whatever your comfortable with.
Develop your product. If you don’t, its false advertisement and you wont make any profit if you dent sell anything.
Set up at reputation. The world is made of money, throw your idea out and get a response. Show off your product.
Know your enemies and allies. There is a fine line of sharing a few of your business ideas and giving your buisness away. Know who to share info with. Also make sure you find a way to outshine your opponent. A suggestion is have a lower price, deals on products, better product, etc.
Last of all, never give up. If you give up, it will show people your uncaring. Persevere through. Sometimes its okay to let go, but know when.
Hope this helps!