Hey there leelad, for someone who's into metal detecting you don't seem to know much about history! I'm starting to lose track of all your requests for possible locations!! Maybe you need to dig into a few books first!
Keen as you are mate don't forget that you can't go digging up scheduled monuments like ancient castles & battlefields!! If you still haven't joined a club yet, check out the 'National Council for Metal Detecting' web-site there's loads of sound advice on there.