YouTube is a great place to learn from as you're most likely to find someone teaching you methods that would be within the sub-genre of your choosing. You'll be walked through the steps you need taken to build the kind a track but I do recommend reading the Ableton user manual so you have a clearer picture. Buy or *cough up* some sample packs as you'll need sounds to work with. Ripping sounds from YouTube is always a cool as idea although you'll need software that records system audio. Don't worry about buying extra plug-ins and shit until you've mastered the built in ones. Basically download Ableton, fuck about and have fun.