Here, here! All very good advice!
One trick I found very telling and useful, as I started jumping in taking video of actual events rather than just my own flying about...
In one feature, I thought I had clipped as much as I thought I could without completely losing the purpose. It was covering a cold water rescue training exercise. I cut 40+ minutes of video down to about four.
As a test, I showed it to a few friends who had nothing to do with the exercise. The telling moment? One such acquaintance, after about a minute said "I'm done". He put the phone down and resumed his conversation with my lovely bride.
Now, one might think "it wasn't the video, it was the more interesting conversationalist", but I know better. (Just don't tell my wife I said that!)
What it told me is this: I need one version as a promo - quick hitting, highlights only, concise and entertaining. The full length version can be made available for those who have a vested interest or just want to see the full story.
So far, that mindset has worked for follow-up projects.
Jeff