**NEED help with dk style game**

Hey.
im making a dk style game and i need to know how to:

make my mc throw a coconut
make tangible structures ( u cant walk thru them )
scrolling terrain
and make my enemies die wehn they get hit by a coconut

if it helps:

character mc - instance - jumpman
enemy - instance - flyork
coconut - instance - coconut
background - instance - background

Thanks a heap.
Greenman.