What do I need to do to start my own at home online business?

I'm interested in opening my own online store and I know how, but what else do I need to do? I'm going to be selling the things my friend and I make such as jewelry, clothing, and aromatherapy products etc. But I'm wondering, do I need to register a company name or anything like that for it to be legal or official or anything? Please I need help I want to get this started as soon as possible.