You may want to do some research on your own as there are various business types. If you're just starting out, then perhaps you should go with a Sole Proprietorship but. that's your choice. Another option is an LLC - doing this keeps your personal assets and your business assets separate. As for your email - you can use your personal email but, having one for your business is probably better so you can stay better organized. You should also check your states guidelines for registering your business, most states make it very easy to do and you're either be required to use your SSN or get an EIN for tax purposes.
These are the basic forms of business ownership:
1. Sole Proprietorship
A sole proprietorship is a business owned by only one person. It is easy to set-up and is the least costly among all forms of ownership. The owner faces unlimited liability; meaning, the creditors of the business may go after the personal assets of the owner if the business cannot pay them. The sole proprietorship form is usually adopted by small business entities.
2. Partnership
A partnership is a business owned by two or more persons who contribute resources into the entity. The partners divide the profits of the business among themselves. In general partnerships, all partners have unlimited liability. In limited partnerships, creditors cannot go after the personal assets of the limited partners.
3. Corporation
A corporation is a business organization that has a separate legal personality from its owners. Ownership in a stock corporation is represented by shares of stock. The owners (stockholders) enjoy limited liability but have limited involvement in the company's operations. The board of directors, an elected group from the stockholders, controls the activities of the corporation. In addition to those basic forms of business ownership, these are some other types of organizations that are common today:
Limited Liability Company
Limited liability companies (LLCs) in the USA, are hybrid forms of business that have characteristics of both a corporation and a partnership. An LLC is not incorporated; hence, it is not considered a corporation. Nonetheless, the owners enjoy limited liability like in a corporation. An LLC may elect to be taxed as a sole proprietorship, a partnership, or a corporation.
Cooperative
A cooperative is a business organization owned by a group of individuals and is operated for their mutual benefit. The persons making up the group are called members. Cooperatives may be incorporated or unincorporated. Some examples of cooperatives are: water and electricity (utility) cooperatives, cooperative banking, credit unions, and housing cooperatives.
