Allied Radio Matrix for Emergency Response (ARMER) Trunking System, Various, Minnesota - Scanner Frequencies
Is the system you will be interested in.
The sites you'll want to program are Hennepin East, Hennepin West, Minneapolis City Center Simulcast and Minneapolis N-S Simulcast.
The talkgroups you'll be interested in are the Minnesota Department of Pulbic Safety state patrol (the metro ones) and Minneapolis Police and Fire.
This presumes you are in Minneapolis proper. If you are outside (such as Richfield or Bloomington) then you'd want the smaller city talkgroups and probably those for Hennepin County.
You'll probably find the links below of interest:
Hennepin County (MN) - The RadioReference Wiki
Allied Radio Matrix for Emergency Response (ARMER) - The RadioReference Wiki
You might want to post specific questions about this system in the Minnesota forum - there's lots of good information there.
Also the Minnesota trunked radio system, ARMER, is a very robust system and does lots of neat things. It is a very complex system and will take some time to understand how it all works.