I certainly cannot supply you with advice specific to your case and it's tough to be much help without knowing the facts, which I don't wanna know-Reading the statutes involved is sometimes not that helpful to understanding what is really going to happen in court (gotta have your lawyer tell you what usually happens at one of these before you go to court), but generally you could check out Article 710 of the NY Criminal Procedure Code. You can find it online at Cornell's website, but if you want to be able to read some cases on it and get an idea of what happened in other cases you should go to a law library and look in McKinneys or Consolidated Law Service which have the statute and after it condensed versions of some cases about the stateute. Ther should be a county law library that you should be able to go to, usually in one of the court buildings.
NY Jurisprudence 3rd will also have a section on Mapp Hearings. NY Jur is a kind of a legal encyclopedia. Probably more helpful would be looking in "Handling a Criminal Case in New York" by Gary Muldoon, published by Lawyer's Cooperative Publishing, the law library should have a copy. There is a section on Mapp Hearings.