adobe has an online video workshop which I find is pretty good to start up with. And then you can use the free resource of our Library to get additional knowledge. I'm currently holding onto the Dummies to Lightroom2 from the Library.
check with knowledgebowl...
or cheaper and just as effective, go itunes and look for podcasts by searching for adobe lightroom... at adobe lightroom killer tips you will find what you need...
or just ask here specifics..