Receiving $$ in an online business

I and a friend recently "started" our own little home business making custom childrens hair bows. We haven't registered anything yet. In the future I plan on building our website. My question is this: At what point do I need to worry about business taxes, getting our tax ID and DBA and all that jazz. Am i legally allowed to have a website where people make purchases without doing any of that. Can you make under a certain amount a year without it or before I start a site do I need to do all that. I do not want to get in any legal trouble down the road, but don't want to spend money we don't have now if we don't have to. Any ideas?