Begin with a review of your existing video content. Which formats and topics have you covered, and which have you missied? What's working and what isn't? A thorough audit will help to pick out the strengths and weaknesses of your current videos and suggest areas for improvement. Check out our blog post for a guide to conducting your own video audit.
Professional cameras, like DSLRs, give you fine control over the manual settings of shooting video and allow you to achieve the shallow depth of field (background out of focus) that people rave about. While they're primarily used for photography, DSLRs are incredibly small, work great in low light situations, and pair with a wide range of lenses — making them perfect for video. However, DSLRs do require some training (and additional purchases) of lenses.