Right! I've finally got together a little step-by-step for binding very simple books. We're going to be using a sort of pamphlet stitch. Start by cutting a selection of papers down to the same size. I'm using a mix of watercolour paper and squared paper.
Fold each of your pages in half, as exactly as possible. I'm using a bone folder for an accurate fold.
Measure your book and mark 3 points at equal distances down the spine. Take a drawing pin and, opening it out and laying it flat, make holes through all the layers at the points you've marked.
Now thread a needle with a stout thread or anything you like really. I'm using a linen thread and a bookbinding needle that I get from here, but you can use whatever you've got.
Taking your needle, go in from the outside at point B, back out at point C, round the outside to go in at point A, and then back out again at point B.
Tie the ends in a knot.
Now you can decorate your book. I'm gluing buttons on mine! You may need to trim off the right hand edge for neatness, or leave them, it's up to you. Done! Let me know if you have any problems.