Rule Number two: don't second guess yourself. There are people less skilled than yourself who boldly create content.
Rule number 3: know that we are vain, at heart.
Once you can accept rule 3, notice, the content flows. A deportment of vanity is necessary however, otherwise we would lack the enthusiasm to get up early and write, or play instruments or whatever the creative occupation might be. After all, in order to produce as artist, we have to believe that we have something to offer the world, something that might positively impact change, somehow, somewhere, we hope. So, you see, much of the source of our enthusiasm is the preoccupation with the illusion that what we have to say is important.
That being said, do your creative thing and know, in the back of your mind, because we are made in the image of God that we have the ability to, at some point, create something interesting. So, what are you waiting for? Do what you do.