If you would like to start with rocketry, this is a very easy rocket to print and launch. No assembly required. You can print in PLA, you will have no problem with the heat. I have tested it with B4-4 engine and it flies excellent.

You will only need:

1x Kevlar shock cord 60cm long, 2mm thick or any other heat resistant material (there is a lug inside the body to tie it)
1x parachute (optional but recommended in order to retrieve the rocket for multiple lunches)

18mm engines can fit into the engine compartment.

No glue, no support.

A6-4 engine -> 53m altitude
B4-4 engine -> 135m altitude
C6-5 engine -> 241m altitude
D9-7 engine -> 444m altitude