These are two sites I've found helpful. They can sort of give you a way to step outside your own head and read your work with a different eye.
Scroll down until you see "Self Editing Tip Sheet"
and click on that.
N.B. this is a children's writers' site, but the editing tips, while apparently simple, are good.
This is a romance writers' site, but the information can apply to all fiction writing. It is very well done, amounting to a workshop on in-depth editing.