If I am going to start an internet business do I need to register a business name?

What’s best? Do I create a sole proprietorship? Or, a corporation? It’s going to be my baby, but should I put my husband on the business? Would that mean it is actually a partnership? Or, do I just give him rights of survivorship? What’s best for taxes? What’s best regarding personal libaility? If I am not sure of the name can I change it later? Do I do it with a lawyer or an accountant?