I started out reading Krazy Coupon Lady. I will say this though, definitely check with individual stores to see their policies. It should say on their website. They're all a little different. Like Kroger, where I shop the most, doubles up to $.50 unlimited number of coupons. Meijer doubles up to $.50 but only up to 3 coupons (which is annoying!)
Sometimes I coupon a lot, then I'll slack off for a few months. I go in spells.