For installation you can follow this link 

https://prateekvjoshi.com/2016/01/05/how-to-install-caffe-on-ubuntu/

for training your model you should follow this

https://github.com/NVIDIA/DIGITS/blob/master/examples/fine-tuning/README.md

and finally 

Using this link you can test your tarin model in python

https://prateekvjoshi.com/2016/02/23/deep-learning-with-caffe-in-python-part-iv-classifying-an-image/