The only meteorite known from NJ is Deal, which fell 5 miles SW of Long Branch in 1829. It's an L6 and to the best of my knowledge less then 50 grams survives in institutional collections. L just means it's lower in iron, H means higher. The numbers express the degree of processing the material underwent after it's initial formation. The higher the number, the further from it's original state. You really need to learn from the ground up, and not in snippets. Plenty of good books and google will bring you many sites, besides anything that might be a sticky in this category of TNet. TNet is a great site. For meteorites in particular, you might also consider this forum, run by Geoff Notkin, the other gentleman from Meteorite Men.
Club Space Rock - Meteorites and Meteorite Hunting
Your best bet, since you like to metal detect and have experience there, is to hook up, if at all possible, with someone in Arizona and hunt a known strewn field like Gold Basin. Arizona, and California and Nevada dry lakes, are your best bet if you really want to find one in your lifetime. NJ is about the worse terrane imaginable for cold meteorite hunting. As is the Northeast in general. One did fall recently in Connecticut. 2 stones found, both hit houses. May very well be more out there and there is at least one person looking hard. He already has pieces from the first stone because he was quick enough to beat everyone to the homeowner and bought a few fragments.
So, observed falls are different. Have to just beat a track to the strewn field if it's known, as all the lucky folks in Western Siberia just did with the historic fall there.
Don't want to discourage, but you've got a snowball's chance in Hades of finding a meteorite cold hunting NJ. The odds are truly stacked against you. But you can try, and if it gets to be something that you need to check off a bucket list:
http://www.scientificamerican.com/article.cfm?id=how-to-find-a-meteorite-in-5-steps
