Hi there.. it is quite easy actually.. here is a link to a site that has some nice examples:

http://www.carlvolk.com/photoshop08.htm

also you can do a google search and find a ton more.

As for coloring a B&W photo.. that too couldn't be easier.


1) Open aB&W photo
2) Create a new layer
3) Using the selection tool, isolate the area that you wish to color (lips for example)
4) Paint in the selection tool the color you'd like..
5) Flatter or merge all layers and save your file..

Good luck!