Is there any guide or tutorial that´s good to get into book binding?
Learning by doing is your best bet. Depending on where you live there may be bookbinding classes available. If you are in the DC area The Smithsonian Associates offers beginning bookbinding classes (disclaimer I actually teach some of these classes!) There are often local arts organizations that offer similar classes. Some good traditional books on the topic are:
Bookbinding and the Care of Books by Douglas Cockerell.
Bookbinding & Conservation by Hand by Laura S. Young.
The Thames and Hudson Manual of Bookbinding by Arthur W. Johnson.
For a more modern take I recommend:
Non-Adhesive Bindings: Books without Paste or Glue by Keith Smith.
How to Make Books by Esther K. Smith.
Books, Boxes and Portfolios by Franz Zeier.
The Pocket Paper Engineer, Volumes I & II by Carol Barton.