Starting a contracting business and not sure what else I need(US)

I have my master tradesman license, my LLC set up and my EIN. I am the only employee at the moment, but I need to get insurance, a company bank account, and the actual contractor license as far as I know.

What am I missing to do this and not get in tax or compliance trouble?

More detail: This is a commercial/industrial electrical maintenance company I'm trying to make. Preventative maintenance, regular inspections of equipment, safety checks and general repairs offered via service contract with emergency service available within x amount of time.

Any recommendations on insurance providers and am I not thinking of anything here?

Also any advice is welcome.

Thanks!