What is unique about your content or skills. Are there others out on the internet that do what you do? If so, can you do it better? How could you make your channel the best it can.
Consider making your content a fun activity and something others would enjoy just as much as you do. Making compelling videos will always bring people back to your channel.
Are you funny? Do you like unboxing videos? Do you play video games?
Now that you have an idea in mind go out and film as much as possible. If you are capturing footage from your device, head to the next section on specifics on how to capture with an iPhone, iPad, or Android Device.