Well, the best I can do is give you a start (and hopefully others will chime in as well!)
#4 is pretty broad. Camera can probably be something as simple as a webcam -- all you're doing is identifying RED, so it's not like you'll need a massively expensive camera. I'd use OpenCV, a computer vision suite, but if you do that you'd be pretty limited to something that goes beyond the idea of a "microcontroller", so it might depend on your budget. Other people on this forum have been talking about using the Axon microcontroller along with a "blackfin" camera, but I have no idea what that is :-P
#5 is really hard, and you'll need to give us more information. The control should be simple enough, but if the package is only dropping a few feet onto a small target it'll be way harder than if it's dropping 100 feet onto a large one...