If you're just getting started on frugal living, couponing, stockpiling, etc., it can be too overwhelming to tackle all at once.
My suggestion is to start with CVS. Their reward program is tops on my list and you can really get the hang of couponing and sale matching at this one store. In the meantime, your budget will begin to loosen as you no longer have to spend much for health, beauty and household items.
When I was getting started, I went Deal Seeking Mom, clicked on Drugstores and read through the How-To section. This blog contained the most concise and easy-to-follow plan description and deal scenarios.
Just tackle CVS and then, as you build confidence, branch out a little more. Most people who have adopted the frugal lifestyle did not make every change all at once. Don't worry -- the great deals will still be there! : )