Where ever they have a need is the best place. So whether in Michigan or anywhere else, find out what people need or what people need cheaper or what people need faster. Whatever you enjoy doing is the best field. The work will seem easier and more enjoyable if you already like it and are good at it. How do you start it? First draw up a business plan, that tells you (and others) what to do and how you are going to go about it. Look for models online. For example a landscaping company. You are going to need landscaping equipment. Do you already have that? If not you need to lease or buy some. Where are you going to get the money? That is called financing and people will want to see the business plan before they loan you any. You are going to have to make people aware of your business or they won't know to come to you fro landscaping. That is called marketing. Good luck!