With my channel I've been quite lucky so far, but for tips etc. just have fun whilst recording/playing a game!
chances are if your having fun and enjoying yourself then so will the people watching your videos and in no time you'll have subscribers coming in
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In regards to BL2 and playing old school games, you'll be surprised how many people watch old school games. I'm LP'ing Legend of Zelda A link to the Past and Harry Potter and the Chamber of Secrets and both are doing very well
I guess if you want an easy way to get views then just play recent games