I want to start a gaming YouTube channel but i need idea on what to do?

If you play on a PC download a good screen recorder such as camstudio or fraps. If your on a console get an elgato screen cap or another form of screen recorder. Then get yourself a good microphone. Belive it or not Good audio is helpful. Record yourself write a script if you want and reherse it. And don't be shy. Most importantly have fun!

Start off with an intro video on the games you like then begin by creating new projects on the games you love. Do like 1 or 2 vids a week and if you get a lot of views continue to build your channel!

Get fraps. Have a good pc. Create good content. Have realistic aims (eg 1000 subs after a year). Upload regularly. Do vids daily or every other day. Utube is hard work

A good game to do a YouTube series on would be day z, considering there aren't a lot of people doing it yet, and it will probably become a big game once the official release