Instructables offers an excellent 4 class session including theory and very practical instructions on rocketry from stomp rockets to engine rockets. To quote them:
This class is aimed at the budding rocket enthusiast, and aims to keep things accessible by using mostly household items to create our own rockets. The class culminates with making and launching a solid fuel rocket, capable of achieving altitudes that would make any astronaut dizzy.
Strap in, Cadet, we're about to shoot for the stars!