Many people dream and talk about starting their own business for years if they ever get around to doing it. It's important to take a lot of things into consideration before starting your business, whether you'd like to start an L.L.C. or start a corporation.
Make sure there is a demand for your product or service. You may have a great idea and a great product at hand, but if you're planning on opening up an ice cream shop in the south pole, you wouldn't do to good, because there is no demand for it. Also consider your competitors, if there were a barber shop on every block in a certain neighborhood, you probably wouldn't want to open another one in that same neighborhood, even if you did have the superior service, sometimes it's just too hard to convince people to stray away from their regular spots.
Have a marketing plan. If you're opening a business, plan on what type of marketing strategies you want to take to ensure people know about your business. You may have the best product or service, but if no one knows about it.
Learn about what filings you need to complete before starting your business. A lot of people are under the assumption that they can just get a business license or file for a corporation and they're ready to go, but depending on your county and city and the type of business you're running you may need additional documentation to be filed in order to be in compliance with the your local government.
The reason you start your own business is to be your own boss and have fun doing what you do, so while it's important to keep an active part of starting and running your business, it's also important to not stress too much. Good Luck!