You're trying to program a fairly new trunked system with a brand new scanner...hopefully you realize you're on the thin edge of the wedge as far as specific knowledge or 'stepping you through the programming' is concerned.
My suggestion to you is to do the following:
1. Read the manual (assuming you haven't already) and try to learn as much about this scanner as possible.
2. Read the forums here, and specifically about Bell Fleetnet. Then again, a few members gave you some pretty precise directions on what is *generally* needed to program a Motorola Type 2 VHF trunking system...namely the base/offset/step.
3. Try to confirm that you can actually recieve the control channel you're trying to track by tuning the scanner to it manually and listening for the familiar motorboat sound.
4. Rather than jumping in with both feet and trying to make it work with the control channel only feature, program all of the voice channels in.
5. Go to butel.nl and download the ARC996 software. Many of us use Butel's other ARC software and they are, for the most part, superior pieces of software to the Uniden stuff.
I'm sorry if this sounds rude, but the fact is that you're off in an area where Fleetnet is still (I believe) being rolled out and you're using a brand-spanking-new scanner that most of us haven't laid much more than eyes on. Perhaps asking generic questions about the capabilities of that model would be better suited in the Uniden forum. But all of the Fleetnet advice holds true: you need to program those base frequencies, channel offsets and the channel spacing or it's a no-go for listening to that system.
Good luck.
