I second what Scott Farris and John Van Houten wrote. I didn't get any help whatsoever after moving here. I poured over WMA maps available online at the NJ Div of Fish and Game, compared them to road maps, and did lots of driving around and asking questions. Then, once I found places to put in, I spent many many many many many many many many many hours paddling around. Over the years, you come to recognize people and their boats and they come to recognize you. You chat briefly with them at the boat launches, or somethimes even out in the marsh. If you're nice, polite, and help them out a bit sometimes, they may just give you a tip or two of another place you can try out, or things to watch out for like mud flats

as someone said, it can take years. I'm still learning.
Quick story of what not to do... the one WMA I hunt is heavily hunted and there were two guys in a tiny Johnboat who arrived at the end of the line of waiting vehicles at the boat launch. All of us "veterans" of the area were nice to them as we waited our turn. They explained that they had never hunted there before and did we have any advice of where to go. We all pointed to say where we going to be "generally" and told them that there were these islands "over there" to the left where it should be good and nobody should bother them. Wouldn't you know it, not more than two hours after sunrise, these guys motored all over the WMA, checked where everybody was, and it seemed they were also chasing/jump shooting ducks. They had the intelligence to leave before anyone else. I met up with two seperate guys at the launch on my way out and we all noticed the antics of these dolts. I could tell that the other were not impressed. Well, a few weeks later, they showed up again, and somehow, in the preceeding weeks, the word had passed around, and nobody said a word to them, I know I gave them some dark looks. Actually, I think someone wrote something and put it under their windshield wipers at the end of the morning hunt. I thought about saying something about chasing ducks, but I'm a firm believe in what goes around comes around and these guys will get what's coming to them in the end, the hard way.
During hunting season, as someone else wrote, it all changes. Ducks weren't where you saw them earlier in the year, and late season and nasty weather really makes things out in the marsh look very very different at dark-thirty in the morning. Bring a GPS and mark promising locations on it. Watch the birds, where they come from, and where they're going, and where they seem to be landing. Sometimes yuo can get there, and sometimes, it just isn't worth it... we've all been there, I think.
Oh yeah, going out earlier than others is a good tip. However, arguing with someone about being "in their spot" when they arrive after you has to be one of the worst experiences
EVER. You just wish people would grow up.
my $0.02
Anthony