The latest version of PPS lets you import directly from Radio Reference. It's very easy to pick talkgroups you want to hear and build a knob position for it now. You can just select the talkgroups you want and not do a massive site/tg import into PPS.
Keeping in mind to do STARS, you'll need a VHF G5 (7/800 and VHF) or look at G2/G3 options.
If you build a trunked system in PPS with multiple sites, when you select that knob it will lock on to the site with the best signal and stay with it until you lose signal, then find the next one. If you want to do 1 site at a time, you'll need to import then one at a time.