@tutututututuru, congrats on the commitment! And yes, you will have priority for BJ, or your 3rd choice, over anyone who deposits after you and requests those for their first choice.
As far as apps go, I believe that you should decline admissions to schools that you may have already been accepted. If there are other schools that you are awaiting decisions, wait until an admittance is offered, and then decline. At least I think that is the proper way.