Growing is a process wich can either go Slow or Fast depending on Quality, Quantity and Genre.
Besides that SEO is the most important thing in ranking your video's. Simple things as the Title, Description, Tags are all things which count in growing your channel.
Last part is the use of social media and then i don't talk about dropping your video in every single place you can find but actually soialize with like minded people, get a conversation going and expand your network.