ecstatic - congrats on making it this far =) the whole process varies! some people hear within a few days.. others in a few months so hopefully you'll hear back very soon! there is no guarantee that you will be accepted after you've done your medicals... if u read back a few pages there was a person on here that made it as far as medicals and security and then got turned away =/
and yes, they'll advise you of where to go to do your medicals, and what to do with your security
good luck =)