Start off by making up flyers that state your services and fees as well as specials that you are running. Mail or pass those out to the companies you are targeting. Be prepared to work a side job with a paycheck and run your business on the side as well. Make up a web address also to spread the name of your company, you can design one for 15 $ or less on yahoo small business. Marketing and PR is going to be the toughest for you so be prepared. Maybe have some pictures of the samples that you are selling to show business owners etc.... Give them incentives to come to you like buy one get one free or free delivery etc....
Starting a business, you need a catchy name of course, think of one and then go to the court house and get a DBA "doing business as" and get you tax ID ready, also from the court house, and open a separate business account. All this can be done with 30 $ or less. Be prepared to work harder than all your friends, it takes 2-3 years for a business to take off and you will probably not see a profit from this for at least 2-3 years and be prepared to work a side job to keep your business alive until it takes off.
Me, I am doing business now.