Relax dude, give us time-
First; i doubt its the head gasket-more than likely its the coolant return hose.
Or it could be something as simple as a loose rad. cap. You mite also want to go around and tighten all of your hose clamps, the dude who owned it before you mite have been a "dum ass"
So start simple, then work your way up- you'll solve it im sure
good luck dude