Well, hand stitching is an art in the itself. There are several ways to do it too. It's down to your preference in my opinion.
So, I will refer you to two different people with two different styles. Al stohlman has a book called the art of hand stitching. This is a very traditional method with a gouge, overstitch wheel, and awl.
The second has several videos on the subject. Very detailed. Nigel armitage has a youtube and paid vimeo channel. The vimeo is well worth the few dollars a month fee, but he gives you the basics on youtube as well. He can do traditional style very well, but has shown a more modern method using pricking irons. It is a very effective method and the one I choose to use.
Hope it helps.