Not sure which side of the States you are, but I prefer ploughed fields. You need to do lots of Historical research, good sites don't just fall into your lap.
Welcome to T- Net greystorm! I agree with everyone that it pays to seek out and detect older sites. Best of luck. Let us know how you do in the coming months.
Welcome to T Net! Spend some time in your library and look through old newspapers for notices of gatherings outside when the dimes, quarters and half dollar were 90% Silver (pre-1965)!