just remember..the average human has about a :60-:90 second attention span.. Make your video short, succinct, direct, and to the point.. And for god sake, spend some time doing the production quality RIGHT. Don't make it sound like your halfway across the room, and have crappy lighting in your living room. Put as much thought into PRODUCING the video as you are in discussing its content. If it looks and sounds like crap, nobody will watch past the first 10 seconds, ESPECIALLY if it's content they don't care or know about. Gotta make it interesting.