You could start by learning about the law in your country. We have quite a few Bitcoin businesses where I live. At a conference I partially attended, they said they needed to fill alot of papers with strict deadlines. It was necessary in order to run their business with Bitcoin. Therefore, I think, it is a good idea to start by getting straight knowledge with the law before actually starting up the business.
If you want to run legitimate business first you have to know what is the regulation about it in your country and how is with paying taxes otherwise you might have some troubles. You also have to be well provided with goods you would like to sell and what would be the most convenient payment system. Daily payments are tricky and maybe not the best choice.
Just what I was thinking and @OP should make sure to do the documentation too. Learning about the regulations is not enough, you have to provide proof/do the documentation process too.