- Listing a phone number with one of the large online directories helps with various verifications (including EV SSL if you need it and facebook page)
- insureon.com to shop for insurance.
- Get bookkeeping software. Right away, and keep it up to date
Edit: the docracy docs are by Techstars: https://www.docracy.com/userprofile/show?userId=30
and Orrick, a law firm: https://www.docracy.com/p/10881/orrick
For payroll, Gusto (formerly ZenPayroll) is wonderful. I can't emphasize enough how much of a headache this takes away from me.