I think you’ve done well for your first video!
A short video clip should be around 60 seconds, according to research into our attention span on watching video clips. I try and choose a song, place markers on every 8 or 16 beats (4mins’ish) and cut my video into short clips then arrange them so they flow.
First thing, make sure you are getting the most out of your camera.
http://abekislevitz.com/understanding-video-in-the-hero4/%5B/url%5D
Different angles, different mounts, some people don’t like the same view on a whole video.
It really depends how much time you want to spend editing. A decent video editor like Final Cut Pro or Premiere may help in the long run, once you have learned how to use it.
Music is a personal choice, like Marmite, they love it or hate it. Color correction (use the american color as it returns a lot more tutorials) can also improve the video look quite a bit too.
Having said that these are not hard rules, I certainly do not follow them all.
Once you have a few videos/edits under your belt you’ll know what you want, what angles, which shots you want. :wink: