How do you make a rocket model?

Normally model rockets are made from kits you buy at a hobby store. The most famous maker of model rocket kits is a company named Estes. Visit links below.

The other option is to build it from scratch. One great way to build from scratch is to purchase the Designer's Special from Estes. It contains an assortment of body tubes, nose cones, and centering rings. Just make sure to use an 18mm. diameter tube for the engine (usually will need to be 2.5in long) and that the Center of Gravity of the Rocket is at least one body diameter ahead of the Center of Pressure and you'll be fine. You can find the Center of Gravity by balancing the rocket with everything in it, and you can find the Center of Pressure of the rocket by balancing a cardboard silhouette of your rocket, or you can find both before you build the rocket by using a simulator like Rocket Modeler II (http://www.grc.NASA.gov/WWW/k-12/rocket/rktsim.html) or RockSim (http://www.apogeerockets.com/rocksim.asp).