There are many options for pool cues and cases. This video tutorial will give you some advice on which ones to choose. Does the case fit your cue properly, or does it put unnecessary pressure on the cue stick? This is just one of the questions involved.
For clarification, check out the second video. If you buy your cue at a store that ends in "Mart" or "General," chances are that you do not have a cue worth using.