Here is some basic that may help. First important tool is the Library. Its chucked full of information. Take lots of notes and if you can get old maps of the area you are going to hunt and compare them with todays maps. You will probably find roads that no longer exist today. Plat Maps also help. Next a good eye. When your out hunting, look for signs that people had been there before. old broken up pottery, bottles, depressions in the ground, flowers that look like they were planted, old orchards, etc. One thing you didn't mention was what type of treasure your looking for, gold, relics, caches, etc. You can even walk the banks of rivers looking for arrow heads. I like to take a sifter with me when I go to a river sometimes just to scoop up the river bottom and sift it to see if I find anything. Its a fun way to still treasure hunt without costing a lot and also carrying a lot of equipment. Be careful of fishing lures! They hurt when you get one in the hand. I found out the hard way. If you really put you mind to it you can find treasure without costing you an arm and a leg. Good Luck!
Your Friend,
Steve in Michigan