Well there are a couple of things here from what I can see. I think you have a good idea by doing some walk throughs, Let's plays, and just some comedy. You need to make sure to actually do commentary and jokes to watch copy right. You could tighten up your script and (for me) your jokes could be a bit more.. humorous. Overall it looks alright. i would say pick a few series and do reviews on a schedule (like monday, wed, friday) or something like that.
And just to proactively address if you ask, I don't do sub for sub, my friend. You could also try to get some partnered friends and have them 'sell' your channel to their partners.