Oh, Deleuze. D+G are interesting and thought-provoking but all but impenetrable. Imagine a textbook written in the style of an experimental novel. Surprise! That's actually your textbook. As with Derrida, I suggest you start with others' synopses, not the originals. Alternately, if you don't have any actual reason to read it (such as actually having a use for something that could reasonably be termed "critical theory"), just throwing them against the wall will likely save a lot of time.