Reddit reviews A Field Guide to Yellowstone and Grand Teton National Parks
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I've only been there once, so take what I say with a grain of salt.
If you are planning to do any backpacking, I highly recommend this guide: http://www.amazon.com/gp/product/0762772549?psc=1&redirect=true&ref_=oh_aui_search_detailpage
It has a bunch of hikes in it, and some very handy indexes (by length, by strenuousness etc) so that you can find you perfect activity.
Be aware of the fact that you have to book campsites through a pretty complicated process, so you should get on that right now.
If you like looking at plants or tracks and figure out what they are, this field guide is excellent. They also have it in the park book stores:
http://www.amazon.com/gp/product/1560375558?psc=1&redirect=true&ref_=oh_aui_search_detailpage
Don't buy or rent bear spray. You can go to any of the back country offices and the park rangers will give you bear spray for free, under the condition that you bring it back to one of the back country offices in the park (honor system).