The SG is a really cool guitar, and that seems like a good value package to me. Like I said, I'd personally favour a Strat or Tele for my first electric, but hey, if you really want to rock - I'm not going to stop you, man! :D

Whatever guitar you get, make sure you have a chance to hold it and make sure that it feels comfortable before making the purchase. And after you've bought it, get your guitar teacher to check it over and make sure everything's in order.