USSOCCER has started a YouTube channel and posted some terrific videos. These 6 are great starters for new referees.
Advice to New Referees: Being an assistant referee
Advice to New Referees: Being the referee
Advice to New Referees: Getting Started
Advice to New Referees: Making a Good Impression
Advice to New Referees: The Pre-game Conference
Advice to New Referees: After the Game
Once you've watched these, keep exploring the other USSOCCER YouTube videos and see what else you might learn!
Also, to see referee education for the MLS referees, check out the Plays of the Week videos at www.proreferees.com.