This videogame commercial featuring Dr. David Klingon, a speaker of German descent, will start you off easy

Of course you can always go visit The Klingon Language Institute (KLI) for online instruction

www.kli.org

Or just buy a damn book on it:

http://www.amazon.com/gp/product/1452118140/ref=as_li_tf_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1452118140&linkCode=as2&tag=backstory0a-20