That great to hear that your son enjoys wrestling. My son was in the same situation last year (he's in 8th grade now, going to the middle school state championship this weekend, with an overall record of 43win 9loss 28pins ). He love's wrestling, So last year in the off season we got him into a wrestling club (the Citadel) and went to every tournament we could. There are tournaments thru out the off season freestyle, folk and greco. If there is not a tournament in Sc, look to see if Nc has one, we went too quiet a few good tournaments there. The key is to keep practicing and getting mat time thru out the off season. As you may know already, it also takes a big comment from mom & dad, since in most cases you will be the one waking up with him at 3 or so in the morning, driving the 3,4 or more hours to get to the tournaments for weight in's (that's half the fun). With what my son did in the off season, I would say that he caught up with most of the kids his age.
So basicly you should find a club and go to all the tournaments you can.
You can go to these sites and get tournament info.
my wife and I run this one
www.greenwavewrestling.comhere's some other's that will be helpful
www.teampalmettowrestling.org/www.scmat.com/ "A CHAMPION WILL ALWAYS DO THOSE THINGS THAT OTHER PEOPLE ARE NOT WILLING TO DO" (Coach M).