For B - Schedule C line B Business Code is a 6 digit number for your activity. If you can't find one that fits you can enter 999999.
Here are the IRS instructions for Schedule C. Business codes start on page 17.
http://www.irs.gov/pub/irs-pdf/i1040sc.pdf
For any 1099 - That is if you paid anyone $600 or more. Then you have to give them a 1099NEC too. So say NO.
