Its a one hit wonder for close quaters, stay round corners and wait for enemy to come to you
After finding a halo 3 skull, simply pick it up as you would any other weapon.
You just go near the skull and press RB like you would pick up a weapon.
any weapon you pick up will have half the ammo it normally would.
You can't. Skulls have to be in your hand to carry them. To fire a weapon, such as the battle rifle, you have to drop the skull, shoot, and pick the skull back up.
No
The first skull on halo 3 is a silver skull. Silver skulls do not award any achievements.
With a weapon in Halo 3
They are in secretive places. There are ones in Multiplayer and in Campaign. http://www.halo3planet.com/halo-3-skull-locations/ - this is a good site but you can search on youtube, they have good tutorials.
once you get a skull in halo 3 you can co to the campain options and turn it on different skulls do different things
13
Dying
http://www.halo3planet.com/halo-3-skull-locations/ is were I found them