Permits needed to start an at-home business?

So my mom has been dreaming of starting a baking business from home her whole life, and I'd really like to make that possible. However, after doing a bit of research, I read that you need all these permits depending on where you live. I've checked the website on sba.gov](http://ift.tt/2vI9kfJ) but it still seems so confusing! If anyone can clarify where to look for what permits I would need in my specific county that would help a ton! Thanks so much! via /r/business http://ift.tt/2vHurPx