Between 10 and 30% of meteorites do not contain sufficient metal to set a metal detector off. While these are generically termed chondrites, they are not all the same. Perhaps the most valuable of all meteorites are those which do not set a metal detector off. As such, it is at least as important to familiarize yourself with what a meteorite might look like before starting to hunt for them. Do a Google search. Familiarize yourself with the terms used. If you don't recognize them, learn them.
Learn what regmaglympts are, and how to recognize them. Learn to do a streak test, valuable for any type of mineral collecting. Study any nearby meteorites and meteorwrongs.
I recently had a near-miss experience with a large stone found in a farming community. In front of a home, I saw a largish stone which appeared to have abundant regmaglympts on it. Tapped it with a carbon-steel file I have, and flakes fell off the top. I think it was sandstone, but not like any sandstone I have seen before. No fusion crust. But some meteorites degrade quickly once they land on earth, and any fusion crust might degrade within a year. Even some meteorites can degrade within a year. Research Howardites for more information.