Just buy some developer, a paper that would lith and the Rudman books. The books will show you what's possible and give you a good starting point, but at the end it's just a matter of trying and discovering what you like.
To me, it is not more difficult than normal printing. I tend you use it for negatives which come out dull when printed regular, and control contrast by changing exposure time.
If you have questions a bit more specific than "explain lith printing to me please", I would be happy to help you further......