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Where do i start? There are so many, i'm very confused as to what the liber are and whats the difference between them and the bigger books. What book should i start with and end with? Thanks

Confusing isn't it? It depends on what you want in the end. Do you want to keep a Christian approach to things? You can. You do you want to keep all Gods and Deities out of the equation? You can. There is no hard and fast way that one is required to work magic. Each member here practices it in their own way, thus, there is no right or wrong way. There is a section here in the forum where you can find several links to free material to help get your feet wet. The link I always recommend is http://magicalpath.net/magic-lessons/

Without being well versed in Crowley's works, with being a beginner, I found Book 4 (includes Magick in Theory and Practice) to be an easy and informative read.

The Book of the Law, Magick without tears and Book4.
http://www.magick4life.com/aleister_crowley_books/

+1 to all of the above , magick in practice and theory would be an ideal place to start.

http://hermetic.com/crowley/

Magick Without Tears is essential.

I'd also recommend the Book of Lies (this one you'll need to re read every few months).

The Law Is For All is also really informative.

Apart from the above suggestions, there are some great authors out there with simpler introductions than attempting to directly tackle AC's Libri. Try books such as "The Magick of Aleister Crowley" by Lon Duquette. Also track down some of the early Equinox volumes online, such Equinox I:I, which contain a variety of writings from poetry to hard core philosophy, and were supposedly written for a general audience. A good biography of AC can also be very helpful, such as Kaczynsky's "Perdurabo" (very in depth) or other shorter ones.