You need to create a Software Configuration, and an application policy in BES.
I would suggest reading the BES administrators guide for detailed instructions on how to do this.
Once you have properly configured Software Configuration and policy... then you add Google Maps .alx and modules (download from Google Maps
and re-index the apploader on the BES.
I realize that you're a new BES admin... but some of the questions you're asking really do warrant the RTFM answer. You really should read the RIM documentation for BES.