Does anyone here train dogs or know of good resources to help along the way? I am getting a 7 month old pit bull and want to begin training right away. I want to do the training myself so I will likely be looking for books or guides for the process.

It was left on a friend's door step and the vet okayed its' health but said it was likely that it came from a neglected home or was abused. She shows no signs of aggression but is very timid towards humans and was very gentle with my friend's shih-tzu.