oddball808

Sorry for the noobish question, i'm new to this. I'm trying to get an a10 to open fire on the first pass but it always flies overhead and turns around then commences it's attack. Also i'm trying to get the gbu harrier to carpet bomb an area. I've tried using dofire and fire commands and I used selectweapon gbu, but i cant get the harrier to drop a single bomb. Can someone please tell me how to accomplish these tasks in easy to understand noob terms?