Remember, when growing your channel you want to make sure your subs are viewers interested in the content you are creating. While it's nice to have family and friends subscribe to make your numbers go up it won't help in the long run if you have a lot of subs but few views. You need to figure out who your ideal audience is, the viewers who will be interested in watching your content. Once you figure that out you can then target that audience with the right tags and keywords. Trust me, there is nothing worse than having 100 subs and only 10 views per video.