i have not made a model rocket for years, but when i did, i just used a VERY basic ignition device. if you are looking for a quick and easy way, you can just use a long wire (double wire) (to stay away from the launch site) and a 9 volt battery. alligator clips on one end to connect to the ignitor at the rocket, and touch the two wires together to the battery. this would be the cheapest and easiest, but since the small 9 volt battery is used, it will take a few seconds for the current in the wire to make the igniter hit enough to ignite the engine. it will work though.
by the way, i used to design and build my own rockets out of garbage. does anyone know how to get the high powered rocket engines in canada? (class E and F)
adam