Do I need a Limited Liability Company (LLC) for my affiliate marketing business?:

Do I need a Limited Liability Company (LLC) for my affiliate marketing business?

I am starting an affiliate marketing business, and have been informed that I should open an LLC to protect myself. Is this wise, how do I go about doing it, and if i’m running it all online from home, do I need a business license? If I have an LLC, can I just open a small business account with Wells Fargo for it?