Start itGet a website going, a logo, business cards, shirts, and some advertising. You also need to have something to sell! If you don't have anything to sell yet, or not very much to sell, I would at least get the website done. I started working on my website a year before I even started breeding. It takes a while to get a website done and looking how you want it.
Oh, and getting the website done quick and paying for a domain name insures that no one will be able to steal your domain name before you get your website set up.