Don, an easy way to get started is to program in a wildcard for this system.
1- Hit program
2- Select new (f1)
2- Select TGRP (f1)
4- Scroll down to TSYS and choose NEW
5- Scroll left and select P25 AUTO
6- Scroll down to Frequencies and scroll right to select
7- Enter 851.6625 (which is the control channel for your county), then save, then save again, then save
again
You should be able to hear the talkgroups and when you do you can hit store (f3) while they are talking and go back later and give them an alpha tag.
Your system is a simulcast system so depending on your location you may suffer from simulcast distortion but if you set it up like this it will be a raw setup but should get you going.