the factory big green book manuals are rather expensive thru toyota publications, about $100 each...there is a vol. 1 & vol. 2 for the camry. you can find them on ebay cheaper occasionally, i was lucky and picked mine up for $50 for both from a guy on ebay
they are pretty straightforward, they show nice large picture diagrams with the parts as well as the specific torque amounts out to the side, then they detail fairly well how to say replace your brakes etc w/step by step instructions.
its prolly a good thing if you have basic knowledge of your car to be able to understand the diagrams & instructions, otherwise you may be scratching your head a lot wondering what they are talking about.
if you want to do any serious work to your engine or want to do DIY regular services to your car like timing belt, brakes,suspension etc. i would highly recommend some kind of service manual whether the big green books or a haynes manual.
i really like having the manuals so i can do everything myself...it saves a lot of money and i know the job was done right by me
hope that helps,
Keri