Assigning site for Rock Hill Referee Association. GameOfficials contains contact information for all officials as well as addresses and directions to all fields.
This is a go-to source for your uniform needs.
"This video will focus on helpful tips for the parents of new referees. "
Online training modules on U.S. Soccer's website for various referee grade levels.
(Go to 42:10 of video)
Great video on what it takes to become a top referee in the EPL.