I had to go to my local tax/business license office and apply for a "fictious name" for our business name. Then had to apply for a business license in that name. I also called the IRS for an id number with that name. But don't do like I did and fall for the "since you and your husband are in the business, you have to file as a partnership" like our local business office did. When we went to file taxes, we were told we would need a private accountant and file a separate business return instead of an in-home business like I do my cleaning business. So I called the IRS and explained to them the situation. Since we were at a loss this first year, they told me not to claim any losses and they could change it to a new business as a sole proprietorship and cancel the old business to issue a new number. So the first year's $3000 expenses is down the drain and we had to start all over and pretend it didn't start until this year. I also registered our domain name with godaddy.com. They had a special running so I got it cheap.
Hope this helps and good luck!