All you need to do is make the animations
Normally there are 2 of them: a sitting in vehicle anim and a death anim.
Go easy on the first one. It's used only to make the character look alive, so a bit of breathing and slight movement will do. If possible the first and last poses of this anim should be identical.
Death animation is played when you shoot the character in it's seat, and his body collapses, after taking a few seconds to review his existence in a huge flashback, think of his wife and kids and make peace with his Creators (BIS and the guy who "Insert Unit"-ed him in the mission editor).
My advice is to unpack those Blackhawks, or the official Chinook or
http://www.spunge.org/~ntib/CustomRTMs.zip and take a look at how it was done. The config part is quite simple too..