There are quite a few travel books. Maybe get them from your library to see what one suites you best.
As your trip is already planned a terrific one to take with you, and also has info about food, customs, travel tips etc, is the DK Eyewitness guide to China. This one would by really usefull for you as it has an excellent review of major tourist places in most cities. As well as maps showing where the must see places are in the various regions, it also has comprehensive diagrams of places like The Temple of Heaven, Forbidden City, Suzhou Gardens etc, etc. Also easy to carry.
If you were researching your own trip & itinerary then Lonely Planet China is good for a bit of ground work. China moves so quickly some info, even in the latest edition can be a bit behind tho. But it has maps with English & Chinese that are great to copy & take with you. Being on a guided tour tho you will probably not need them. The things to know section is comprehensive and it also has a small dictionary of common Mandarin words.
There are also the Fodders, Frommers & Brandt guides plus a few others.
Fodders & Frommers also have websites that might be handy for you.