There is some very good documentation on the physics behavior, as well as a few good templates built-in to C2 that should answer all your questions.
The physics behavior will interact with other objects that have the same behavior, so a platform should have the physics behavior with the immoveable property set to yes.
BTW, as constantly mentioned by Ashley and the mods, you should wait up to 24 hours before bumping your own thread, and being obnoxious about not getting an immediate response is guaranteed to get you ignored very quickly.