M.C.
I started couponing last year and did it for about 3 months, vigorously. Just as one poster mentioned, it's a job and it's time consuming especially if you really want to save big bucks. Make sure you have a room or area in your house where you can store all your coupon stuff--that's a necessity. Also, make sure your printer has plenty of paper and ink to print out coupons off internet sites.
I first started couponing by saving all the circulars that I got in the mail and in the Sunday paper. Clip out all the coupons from the circulars, newspapers, and definitely internet sites. Many store websites also offer coupons on the site, so check that out. I used sites like redplum.com for coupons too. You can google "coupon sites" and it will bring up a whole bunch of coupon sites. At first, I got myself one of those alphabetical file envelopes for coupons and alphabetized my coupons. Later, as I became overwhelmed with coupons, so I found that it was easier to just categorize the coupons in a binder according to store departments like dairy and toiletries. I found the best deals on stuff like toiletries at drug stores like Walgreens and Rite Aid. For canned foods and processed foods, Kroger has the best deals (at least here in Michigan). I think out west, Kroger is called Ralph's. They offer the 10/$10 sales. If you sign up for a Kroger (Ralph's) credit card, they will send you coupons in the mail for stuff like free eggs or new products. Also, when you check out at the register, watch for the coupons that print out. Sometimes they give you money off your entire order, meat and produce department, or a freebie. Those are helpful because some are store coupons which you can combine with a manufacture coupon to double or triple your savings. It also helps to know your store's policy in regards to couponing. Many stores are stricter on couponing since tv shows like, Extreme Couponing, came out. The more you coupon, the more better you get at it. If you invest time into it, you can get it down to a science. I actually found it enjoyable and rewarding once I really got into it. The only problem is, I too have other fish to fry, so I don't coupon as much anymore:(
Good luck!