Warren Buffet says that he "buys what he understands". I think that is a good first step in going into business. Do what you understand best. Once that is established the other items can follow:
1. Do you have any working capital? You will need for deposits, rent, and operating funds to cover the business while it is getting on its feet. It could require enough money to cover the business for up to one year.
2. Do you have a business plan? It is a good idea to write one. There are examples that you can find on the interenet for format. This will be especially important if you plan to borrow money. The plan should outline what you expect to sell, how much, where you anticipate your growth potential to come from, and what you project expenses to be as a minimum.
3. Do you have a location in mind? Is it already equipped or will you have to make provisions to acquire the equipment. Will the location require some modifications for your business. If so, how will you cover that expense?
4. Have you weighed the pros and cons of a franchise in the potential for your business success.
5. Finally, do you realize that most businesses fail in their first year because they are undercapitalized from the start and the owner is too dependent of the cash flow from the business.
If you cannot deal with the above issues. Stay out of the kitchen!