And it would be a good idea to get software, I recommend, as many others will, Win97. It's free for 30 days, but I suggest you buy it. Make sure to get a programming cable from either Radio Shack or GRE and you'll be able to view for yourself how to program and how it's laid out.
Muskogee police, sheriff, fire, and EMS all use the OKWIN statewide P25 digital system... as does Ft Gibson and most public services around the Tulsa region. You're not going to be able to hear them with your PRO-163 since it's an analog scanner. Have you purchased it recently? If so, you might want to consider returning it and buying a PRO-106 or PRO-197. Those scanners will give you the digital capability that you need to monitor that area.