Well first off you should take the carb off and clean it. (Spray it real well with carb cleaner, make sure everything moves correctly and smoothly.) Depending on whether they drained all the fuel and oil before they stored it, you may have to clean out alot of gunk from the gearbox, carb, etc. If there was fuel in it, that's going to be the tough stuff to clean off. If it was running fine before they stored it, those are really the only major things. Aside from that you'll want to get new tires and tubes (at least tubes).
swarm and destroy