1) Staple Binding: This is the simplest method for binding a book. You can use this for notebooks and rough books. Take stack of papers and fold them so that the two corners meet. Use a thick paper or card papers for the cover. Cover the folded papers with this. If the book is small you can use a small stapler for center stapling. For long books a long arm stapler or saddle stapler can be used. Make two or three staples in the centre and your book will be ready.
2) Saddle stitching: Saddle stitching a book is easy and the book will be strongly bound. Keep a stack of papers and cover together just like in the above case. To hold the papers together use a strong paperclip near the center. Keep these on something such that you can make holes in the center. Now make holes with a sharp object on the spine. You can make 2 holes nearer to the
edges of spine and stitch with a strong thread. You can also make three or four holes and stitch accordingly. This will hold the book together.
3) Perfect binding: In this method you hold a stack of signatures and clamp them together. Apply a strong glue on the spine and allow it to dry. Then apply the glue again and attach the cover firmly. Hold this position with a clamper till it dries completely.
There you go. The simplest methods for bookbinding to get you started.