http://www.moneysavingmom.com/ She has 2 posts, CVS 101 and Walgreens 101, that have helped me tremendously. I still refer back to these on occasion. Read her site daily. She offers scenarios, freebie links, and other great tips to help. Also, several people leave their links so you can get even more help. She breaks down ECB program at CVS and Walgreens Register Rewards and rebate deals that really makes it simple(and not so overwhelming).
Here are some other sites to check out
Good ways to acquire coupons
Newspaper My mom and her friend save their inserts for me. Occasionally, one of our local gas stations run a deal where if you fill up with 8 gallons of gas, you get a free paper. With trucks, it's not hard to fill up with that much so I take one, fill up, get a paper, then Joe takes the other and does the same. So right now , I can get 2 Sunday papers. Next Sunday, it will suck because he is leaving at the beginning of this week and I can't drive his truck(it's a stick shift grrrr). Have your neighbors and friends save the inserts for you.
Online There are tons of online place to print coupons. So far, I haven't run into problems here with printed coupons. You might check store policies before you show up with a handful of them
Manufacturer sites Some you can print, some you can get mailed to you. Have a certain product you love, send an email! Most of the time, you can get free coupons. Have a complaint? Let them know. I bought some nasty cake frosting once(from a brand I use regularly) and I got the purchase price refunded and they sent me 2 coupons for free frosting.
Ebay This is good for massive amounts of coupons for stockpiling(and sharing!). I recently purchased 30 $1 off Huggies coupons for only $4. I used Hot Coupon World to find out about the upcoming sale tomorrow at CVS so I could make sure I had coupons(I used the last that I had on the last deal at CVS)
Magazines I have found several for Glade, lotions, and other things in magazines I subscribe too(also found free online!)
Like I said, I'm still learning. I know there are people out there much better at this than I am. The main thing to remember is to take baby steps and don't get frustrated. I does take time and you will make a few mistakes. I always try to look at the ads, then write down whats on sale and then do a rough total using the coupons I have. For CVS, I do all that and try to move everything around until I have the least out of pocket expense. Always take your list, your coupons organized in whatever matter works for you, a calculator, pen or pencil, and extra paper to write on. When I was first starting out, I found it easier if I could make the trip without Baby Girl. She can make a stressful situation even worse.
If anyone has any more suggestions, just leave a comment!
Take your time, and have fun!