I would recommend Mark Wilson's Complete Course to give you a broad overview of magic, followed by either Royal Road to Card Magic, or a book I have just bought, Card College, if you're specialising in cards.
Mentalism is a tricky one, like others have said, there's plenty of stuff out there that makes you think 'is that it?', and it would be easy to get disheartened or not give it the respect it deserves. Banachek's stuff is very guilty of this, it's genieus, sure, but probably not what you are looking for just now. 13 Steps to Mentalism is good, and very detailed, it would probably be your best starting point, but I would recommend a broad overview of magic via Mark Wilson first, just to get you in the swing of things.
There's plenty mind magic in Mark Wilson, and a few card tricks along those lines in RRtCM.
Card College is great, but very expensive, RRtCM is probably better value for money, but quite a challenging read given its age.
Depending on your age, Peter Eldin's Pocket Book of Magic is great for the beginner too, it is aimed at kids, but it has some very good tricks in it, as well as some nice pictures and a short history of magic, and tips on performance etc. Not anywhere near as comprensive as Mark Wilson, but you can get it for £1 on Amazon here:
http://www.amazon.co.uk/Book-Magic-Pete ... 690&sr=8-9
good luck, and if you need any more advice, don't be afraid to ask!