Well, you should really make sure that you can confidently perform the basics. Knowing the fundamentals is important for any cardist. Aside from that, there are some great tutorials on YouTube, Kardistry and the Wire. Genesis by Andrei Jikh has some great beginner material, Papercuts by Chris Hestnes has some beginner cuts and Dan and Dave have a Cardistry 101 series that covers some other easy cuts. You should also make sure you take a look at Jerry's Encyclopedia of Card Flourishes and some other older materials as well.