Welcome TomBeart,
As the others have said, it helps to know what kind of treasure hunting you want to do. I could say that you need a Ground Penetrating Radar Setup. You might then go and spend $50,000 on a decent GPR. Then you find it doesn't work so well hunting coins at the beach...........and you spent a bit more than you needed for the proper equipment.
You could also spend next to nothing...a good pair of hiking boots, quality binoculars, quality digital camera, and good researching skills.
............and contrary to some of what you see here on TNet; Google Earth is worthless for exploration. If you find something interesting on the ground, then you can follow that up with GE examinations. GE is good for finding old trails, old house foundations, and the like. Don't think you will ever find a lost mine or buried treasure using it.
Mike