what to know:
they're delicious
they're hard to find
they're found in very secretive locations not shared by many
What I suggest is on your way back from fishing a location this time of year, walk a trail or venture into the woods in a remote section of woods and try to find spongy ground with many leaves and natural early groundcover starting to come up. Hard packed down dirt doesn't do it - but that soft (not muddy) spongy type of ground with just the right mix of natural grass, sunlight from above, protection from driving winds and maybe some very large older trees both standing and fallen down and decaying - that's a good target location to begin your search. Sides of hills also seem to make good prime real estate too - southern exposure usually. There's several colors - yellow, grey, black and they seem to come up at different times. Check out some website for reports on what they're finding in your region.
http://www.morels.com/forums/forum/new-jersey/
There's as many theories about what to look for as there are people who hunt but the common denominator I've found is ground covered in leaves and soft soil. My personal theory is an early warm and wet week in early April with no hard frost after combined with several nice rain falls and a little humidity makes the perfect conditions for a big year. Warm, moist, etc... somehow catalyzes the process much like a greenhouse. The biggest find I ever had was the side of a hill in the middle of a rain shower. I actually slipped and slid down the hill and when I looked back up to see my track, the leaves were ripped away from the ground and a bunch of mushrooms were there sticking up. We just lifted up leaves from that point on to find them underneath and probably netted 3-4 bag fulls.
When you find them, there's a picker's code to cut them off and leave the bottom of the base still in the ground and to use a potato bag to carry them so the spores will fall back to the ground as you walk around and hopefully make for another crop next year. Whether this has any legit science behind it I have no idea.
Once back home, soak them in water overnight and salt them to drive little bugs and critter out of the folds. Rinse well and let air dry or paper towel pat to the point they're well, about the same as mushrooms you'd buy in a store - moist but not wet or too dry. Sautee or light pan fried are my favorite preps. Salt and pepper with some butter and you have a great side for a steak, burger, chop, etc.