ok well first if you need help with the set up with the basic controls go
herefor customizable controls go
herefor hitting the player try going
here and then go under actionscript then collision detection
ok and as for health you could go
here(that flash would also help with the other 2)
ok and one last thing
here is a list of other helpful tutorials that were made in flash
hope this helps at all
if it doesn't just say so