the government, at all levels, really does hate you.
seriously, there are more ridiculous laws, regulations, inspections, taxes, bribes (ohhh, did I say it?), etc regarding small business at all levels of government that you simply won't or can't know about.
And I don't care how much research you do (and you should, esp state, county and local), they will still magically find new ones that they barely understand that harm your business/cost you money.
quickies:
Your lawyers are worth every penny they cost.
A good accountant is not a cost but an asset. But remember that things you tell your accountant are not privileged information like they are with a tax lawyer.
Sell, sell, sell, sell, sell. Sales is everything, marketing is bullshit, but sales and closing are everything. You will be selling damn near every minute of the day.
A customer that doesn't pay is not a good customer. Collecting money is the worst part of the job.
You get to pick your own hours, you can work any 18 hours a day you want. (not a joke, expect your sleep to go to shit too as you stress over how to fix x, y, or z or how to make payroll tomorrow)
Everyone gets paid before you do.