Beginner

I am wanting to know how much a 280z is worth. This particular one is in a pasture, rear hatch is bent and maybe needs replacing (not sure about this), some work on the body where the hatch is bent, and some other minor skin work. However, other than this the body is really straight. The interior is trash. Has original wheels I think. I'm not sure what year it is but has the rectangluar looking vents on the hood. Hope someone can help me out. I would like to know where to start w/$$. I want to be fair about it but don't want to go to far on his side. Thanks TX