This is a great guide - I'm currently at 33 subscribers and really want to get to 100 this year, s this helped tons. I've been the smug YouTuber for awhile, as much as I hate to admit it XD but now I'm definitely going to take the smart youtuber's phrase to heart.
I have a question - how do you find Facebook groups and Twitter pages to advertise on? I've tried looking for some close to what I do (cover video game music) and have never been able to find any quite in my nitch. Perhaps I am thinking a bit to narrow-minded though, and would like to know how exactly to find groups to advertise to.