One tip for you, find a game that you like to play and see what kind of videos are out there on it. A lot of games like Battlefield 4 and GTA V are over saturated with channels that play those titles. The key is to brand yourself and make videos that are very uncommon about that title game, or there aren't any videos at all! Give the viewer something different that attracts them to your channel instead of the guy with 100k subscribers already, wish you the best with the channel!