call and ask the people who's job it is to know.
Ask for names and numbers, be polite, assume nothing, ask tons of questions, ask multiple people the same question, go in person and ask, make it a point to learn as much as possible, and then thank people for taking the time to help you. They will be much more willing to spend a long time helping you.
When I started my company I fried my brain trying to figure it out myself, it's explained so poorly online, just go in and talk to people that can answer questions for your situation.
When I did it, I was kind, persistent, and a bit annoying, but made up for it with a lot of thank you's. It worked and everything was explained to me about payroll, licensing, websites to register on, taxes and filing dates and procedures, etc.