My Advice would be this,
1) Speak LOUDLY and CLEARLY
2) If your not having FUN, neither will the viewers
3) DON'T FORCE YOURSELF TO PLAY - As a Viewer I can tell if your not having fun
4) DONT try and be FUNNY - If you can't think of anything funny to say, Tell us a story? Personal or Imaginary
5) I'd rather watch 2 - 10 MINUTE EPISODES, than 1, 20+ Minute Video, People don't have that much time, Its better to leave people wanting MORE than Getting BORED
6) Get a Facecam
7) Get an Intro (RavenProDesign.com)
8.) Try Choosing a Topic or a Theme - PER EPISODE
9) Watch more TV, Find out what makes TV interesting, Cause YOUTUBE is exactly the SAME
Good Luck