LLC. Hopefully it protects my home and family from any business misdeeds. Once you done an LLC, I don't believe you can mix business things and personal.
What is a dnb number?You can file the LLC your self through your local Secretary of State. When you use someone like Legal Zoom they charge you a high price for something you can do yourself and in only a matter of minutes.
After you set up your LLC, go to irs.org and apply for an EIN for an llc. It'll give you your number right on line. Save it to your computer and print it.
Also get your DUNS and Bradstreet number. Please don't make the mistake of paying DNB for anything. You will get a DNB number for free.
Use the EIN on your llc accounts, insurance etc.