You can just hook it up at serving pressure and let it sit for a week. That's what I usually do. If you're in a hurry, you can shake it. If you're in a BIG hurry, you can crank up the psi to 30 and shake it.
Just make sure to purge the oxygen from the top of the keg. Just pull the relief valve a few times.
On Tap: Whatever I just brewed (got sick of updating it)