I am starting a website where I post random questions and people answer them. I want to make money through ad revenue and eventually add an online store that sells t-shirts through Cafepress.com. (Cafepress allows you to create an online store by just uploading your design and they will print it on the t-shirt and ship it out for you.) Do I need to register this as a formal business? If so, what kind of business..(LLC)? How do I go about it? I live in Maryland.