No, first you've got to find an existing tradesperson and apprentice under them, even if you could already pass the exam on your own. For a few weeks is it? Years, typically. To become a journeyman. Still can't work for yourself, now you have to work under them for a few more years.
Figure out how to file papers for an LLC. Maybe you need a lawyer. Tax accounting will be fun too. Do any of the cities you operate in have a different sales tax rate? Which of your business expenses can be deducted in the current year and which have to be depreciated? Is that the same for things you resell?
Guess what happens if you want to move to another state.