You're in Boston PD District 4, so you'll want 460.500. It can be very busy, especially on weekend nights.
Boston Fire uses one channel for dispatch, 483.1625, one primary fireground 483.1875, and two secondary fireground channels 483.2125 and 483.2375. They also tone out dispatch on 453.650.
Boston EMS dispatches on 462.975.
Transit Police are 470.6625. They're pretty busy and cover a lot of area outside of Boston as well as Boston itself.
That will get you started and after you get used to our funny accents, you can add to the list.
I don't think that the BC350c does trunking, so the state police aren't going to be on your scan list.