With every possible stylistic element in writing, use it as if you will never be the genius who breaks all the rules. Start by keeping every single rule thoroughly. Minimize your use of all stylistic elements and focus on conveying your meaning in the simplest words possible. Use the fewest words possible to paint your description, sketch your characters, and set your scene.
One day, after practicing this until you have it down cold, you will find that you just know an ellipsis (or other stylistic element or larger descriptive word) will absolutely make a sentence. Use it then.
In general the rule is to focus on simplicity. Once you have mastered the rule, you may begin to break it.