My advise would be to work or volunteer in the type of private care business you would like to own someday. This will give you first hand experience on how things are done. As for getting a business license you'll just need to pay a fee and register a tax id number for the business, obtain a ficticious business name/DBA (doing business as), local business license, and decide whether you want to be a sole proprietor, partnership, LLC etc. plus several other licenses related to opening a private care business.