A link to HSLDA where you can find homeschool laws for every state including SC:
http://www.hslda.org/laws/default.asp?State=SC
Websites:
https://ed.sc.gov/districts-schools/state-accountability/home-schooling/
SCAIHS – South Carolina Association of Independent Home Schools
http://www.homeschoolinginsouthcarolina.com/
http://www.carolinahomeschooler.com/