If your naming your business you want to take into account naming conventions and what they mean to a small business.
If your name was John Doe, and you called yourself John Doe Reptiles, then you don't have to register for certain aspects (and you also don't have to get a GST number until you reach 30k income annually).
If you use a name other than your own you have to register your business. I'm not sure of what all it entails. I'm still looking for my small business owners guide that got lost in the last move
If you're going to be doing anything that doesn't use your given name, pay for a name search, as you don't want someone to come along after you have a recognized name and force you to stop using it because you infringe on their trademarked business title.