Your three main sources are the comic strips, which i've failed miserably on this year with everything that's been going on. But there are approx. 500 for you to dig through.
This site originally used to be the comic strip site . . . until the forums kinda took over. But there are some remnants of the old site still hanging around, including a description of most of the gang: http://bobthepleo.com/pleo/comics/characters.php
and an out-of-date wiki: http://bobthepleo.com/pleo/comics/wiki.php
Lastly, there are the books . . . all two of them. The first book "It's the Great Pepperoni, Bob the Pleo" came out about two years ago. It's still available on Amazon and you should be able to special order it from your local book store. After the first printing sold out, it has been relegated to the print-on-demand, but somebody must still be buying copies as I did get a second (although small) royalty check. http://www.amazon.com/Its-Great-Pepperoni-Bob-Pleo/dp/1449588875/
A early preview/first draft is here: http://bobthepleo.com/pleo/comics/wiki/Great_Pepperoni.pdf
The main plot is still the same, but anyone who owns a copy will tell you the printed copy is quite different.
The second book is the one this topic is all about, and isn't available quite yet . . .
As for the town itself, I built a model of the main street in Roller Coaster Tycoon 3. If you have the right set of texture packs, you can do an interesting fly-thru or ride the train between library, bob's castle, and the picnic grounds on lookout mountain. It is, after all, roller coaster tycoon, so I had to build the obligatory roller coaster . . . . But since it's not really a user-freindly model, I've been working on a version of the town in Minecraft. It's blockier and not as elegant as the RCT3, but it's a lot more interactive and better suited for socializing. I've got most of the main street done as well as the beginnings of Bob's castle, Dr. Mel's lair, and a custom texture pack. The neat thing on the minecraft version is, once we get the town finished, there will also be an interactive set of mystery/adventure challenges for people to be able to play.