1-Be active in the community. Comment, channel comment, subscribe, make friends, make/post video responses. Be nice to people, they'll be nice to you.
2-Share your videos with people you know in real life, get them to share them as well. Post your videos on myspace bulletins, facebook, twitter.
3-Promoted videos. I reccomend this if you don't mind paying youtube for more views, but you should wait until you have at least 10-20 videos. Reason being, you promote a video, and you are paying per click. Person watches it, likes it, and they may want to see what else you have. They go to your channel, you are much better off with more videos than less. And when that happens, all you paid for was that one click. You want to give people a reason to want to watch you, and obviously you have to have videos for that.