OK first of all i think its good you've taken into consideration what you should buy and you know generally what to buy to get it started up. For recording device, I would reccomend getting an elgato game capture hd (or if then one of the newer ones) I have a few friends who use it to record their gameplay and they say its fantastic at it and the positive is that it is smaller than an hd pvr and easier to set up. The rest of the channel is just down to you being yourself i suppose. Oh and try not to play too much of one game as most youtubers at the moment play multiple games and so it keeps their audience entertained rather than just watching one game and being bored of that game eventually. I think thats about it really other than enjoy yourself!