Could you recommend some good books or good websites in order to quickly learn Mandarin?

Chinese for dummies book is good:
Amazon.com: Chinese For Dummies (For Dummies (Lifestyles Paperback)) (9780764583759): Wendy Abraham: Books

Or you could try this:
Learning Chinese characters: a revolutionary new way to learn and remember the 800 most basic chinese characters [Book]

BBC Languages Chinese:
BBC - Languages - Chinese: All you need to start learning Chinese

This website has lots of books for Chinese on:
Hanban Book Store

And a little book for writing characters in is a good idea, but I couldn't find a link
Good Luck! 好运

Yeah~ I believe Chinese is necessary,I suggest you find some

Professional mandarin institutions,or you can find some private

Tutors,but the fee may high.As I know some good schools,such as

Mandarin Garden,their school lessons reviews are frequent,and warm,there are also exceed 600 teachers for your choice,so you can get the further information by addressing the following website:

learn chinese in shanghai,learn mandarin,Mandaringarden and there is a good answer