It's not that difficult.
1: Create the P25 system on D2. You'll need to enter the specific system ID# (B0C), WACN (BE000), and the control & alt control frequencies for the site you want to use.
2: D4 is where you will enter the talk group(s) you want to monitor for the system (in HEX mode as indicated in the RR DB).
3: D5 is where you will then create the zone and switch position. Use "Trunking TG Scan". Select one or multiple of the TG's you created in step 2 above.
4: Save your profile work. Program / Upload to G5.
The one thing to keep in mind is that the G5 uses an internal antenna for VHF. The antenna on top is for 700/800 Mhz systems. Since Wiscom is a statewide VHF P1 system, your G5 might be challenged at times to receive your local tower. It just depends on how close you are.
If you want, send me a PM. Include your codeplug file and I'll start a basic setup for you that you can then modify and enhance.