No matter what else, avoid the poor quality video or your prospective viewers will take one look and move along. The picture and sound quality must be good to excellent, to keep the viewer interested in continuing with your work. Things to bear in mind include:
Ensure that the lighting is good. Bad lighting is irritating because there are shadows, blurry bits and an inability to focus properly. All of this suggests poor quality and soon becomes so annoying it's hard to persevere with. Film with daylight where possible or use excellent indoor lighting in the filming areas. Don't have annoying or distracting noises in the background of videos. Such noises can make it difficult to hear your voice may over them. In general, it reduces the professional nature of your work. Make use of sound effects. For example: If someone is meant to be slapping someone, use sound effects, so that it seems real. These help to make the video more professional. If you're recording videos in real life, don't use your phone; use an actual camera. If you're making videos on your computer, don't use a camera; use screencasting or video capture software like Hypercam or Bandicam. If you're playing on a game console, use a capture card.