Well I say at first focus on quality make sure videos look, and sound good, make sure the channel looks nice and professional and the thumbnails look good then focus on promoting. Tips for promoting Twitter has been a good place for me, I recommend trying to find your target audience and message them. As an example I'll use my youtube guide series, on twitter I looked for people who would enjoy my gameplay lets say it was a cod gameplay, then I narrowed that down to cod fans who had channels, then I narrowed it down again to cod fans who had channels with less than 100 subs. Low and behold many of them looked at the videos, left likes, and returned to watch them again and many became subscribers. Its all about finding a smaller audience inside a bigger one not trying to appeal to everyone but a small group.
Of course this worked for me you may have different results depending on what you do. Hope this helps somewhat
