As i was cruising along a gravel road at half throttle on 4th gear my bike sputtered and stalled. It still kicks over but there are two head bolts that missing. Actually one was broken off. There is black gunk/grease around the spark plug on top of the head and some antifreeze on the head. Does this sound like a big project? I am an amatuer with the wrenches. Would I be better off taking it in to a pro?
any help advice would be appreciated.

Sounds bad. Take it to a pro.:badgerslayer

If you're not good with working on bikes, take it to a pro, you're gonna have to pull the engine apart.

because the head bolts came out most likely would of blown head gasket, take the cylinder off take it to a bike shop get them to heli-coil the studs and get new ones fitted, then get new head gaskets they probably use rubber o rings as gaskets i had the same problem with my bike

That blown head gasket could have also caused a lean condition, that would be very bad