Here's a snippet from Morpher's tutorial:
"This is a relatively simple method of making an airstrike.
However there are obviously good things and bad things.The only bad thing is,is that the plane can't be shot down. I will supply you with some template shps to use (bear in mind there not perfect)."
And Judeau's tutorial:
"In this tutorial we'll be making an arcing flamethrower with improved graphics
oh yeah i didn't feel like explaining ALL things so i propse you do this tutorial once you know how weapons and animations work"

Both tutorials are simple and are a good way to improve your modding skills, specially how to deal with weapons, projectiles and warheads.
Tutorial Links:
-> Targetable Airstrikes, by Morpher.
-> Improved Flamethrower, by Judeau.