I would HIGHLY recommend at least the first few MacProVideo.com tutorials about Logic, they saved me a ton of time when I first started using it. Heard they’ve only gotten better.
SFLogicninja on YouTube has some good videos as well.
Logic is a bit of a beast, so you won’t be able to tackle everything in one go. I’d suggest taking everyone else’s advice and applying it to small test projects where you actually try and work on something. By using the same fundamental tools over and over, you’ll get a grip on the basics of logic. Beyond that you sort of tack on things for whatever else you might need.