10 Helpful Editing Tips
Line Editing in 10 Easy Steps
And some inspiration to get you started... Great Books Aren't Written, They're Mutilated and Pieced Back Together in Groundbreaking Intensive Surgery
Even if you aren't revising something big, these are some nice tips that apply to short stories also.
"Good novels are not written, they are rewritten. Great novels are diamonds mined from layered rewrites.’"
Piers Paul Read