I am a young bridge player, and I think the best way to teach beginners is to start with declarer play and defence. Most bridge books for beginners start out with bidding, but I find bidding to be extremely dry and boring. I would also give them bidding (maybe even declarer play and defence cheat sheets to start with) cheat sheets, and only teach them bidding when they have gotten into bridge - otherwise you will scare them off. I once taught the basics of bridge to some of my mates (14-15 year old boys - not the average bridge player demographic) and they enjoyed it, but I know that they probably wouldn't want to spend weeks learning it. I think kids who like strategic games such as chess will like bridge. I would also particularly target chess players as they are already willing to spend time playing a game that isn't on a computer. Anyway, I hope this was helpful and good luck.