Hogwash. For a couple hundred bucks or less you can get yourself an actual fully legal corporation registered with the state and everything. At least in Ohio, but I doubt the process in other states vary all that much.
Hold one corporate meeting with a quorum of officers in attendance a year, and take notes, and you keep your corporation fully legal in perpetuity.
If that is too much regulation for you to handle, I suggest you stick with your day job.
Until you are making decent money, turbotax online will handle all of you taxes for about a hundred bucks. And until you are making decent money, accounting standards don't matter, because nobody cares how you accounted for that $5 "business lunch" at subway. And once you are making enough money that somebody might care, well then you can afford an accountant.
And as far as health code and environmental regulations, exactly what kind of operation were you envisioning starting in your garage that would be affected? Are you really pissed you can't pack 30 children in there to make t-shirts with noxious chemicals?