You are on the right track, JH, research is the key! Become proficent in finding old areas and securing permision to hunt there and you will make very nice finds
Never overlook areas because they have been hunted before. In metal detecting there are things as seldom as satisfying as making a good find in an area that has been pounded over for many years and missed by someone else.
Detectorists often say that an area is never fully hunted out and i can attest to this firsthand.
Get researching and you might be surprised what you come up with in your area. Dont be hesitant to ask permission to detect that old house yard down the street or that old church on the other side of town. The worst that can happen is you get denied, but more often enough you will get the go ahead and that just might be the edge over the last guy that thought about detecting it but never got the gumption up to ask.
Keep us posted