In a rare moment of altruism I feel the need to help, I've been there and feel sympathy!
Choppers as most people editing are aware, are like herding cats. Such a PITA. But worth it.
The only thing that helped me was to de-pbo some of the older BAS missions and look at how they did them.
If in doubt, search. Still don't know? Search. Your question has been answered somewhere, finding the answer can be easier and less time-consuming than trying to get choppers to do what you want them to do.
The answer for me was to use the "fastins.sqs" script , by TJ, that was included in a couple of the BAS addons (BAS_MH60 was one) and sit at the pc for hours whacking my head against the monitor trying to figure out what was going on. It took bloody hours but it does come. You're using stuff like "helo1 land "LAND"; "_x unassignVehicle Helo1" forEach units playergrp". A script is not much more than that.
If you need help looking into missions read the Mission Editing FAQ at
http://www.flashpoint1985.com/cgi-bin/ikonboard311/ikonboard.cgi?s=3c45958532ba70c92d44e4f1b950f7a1;act=ST;f=7;t=26723It's a handy bookmark to have.
Also, looking into missions and addons requires:
http://ofp.gamezone.cz/utilities/pbo_decryptor15.zipand Chris' OFP Script Editor (do a quick search at Ofpec).