After conducting over 70 custom shoe workshops around the world - and making about 200 unique pairs myself - I still think this early (2008) tutorial video is worth watching.
Learning how to make nice looking, wearable custom shoes can take a lot of practice. That trial and error is both time consuming and expensive, and I know that although many young people might want to personalize their shoes, most will either get discouraged by early failures or get tapped out by the costs involved. I hope this video will save you some of the trial and error - and expense - that I went through.
Feel free to shoot me questions in the discussion threads below, and I'll try to be better about answering than I have been on Youtube.