M.J.
It's all about portion control and calories & fat content. Read labels carefully. Look at the nutrition info. with recipes and at restaurants. Aim for less than 300 calories with entrees. With meats, eat a piece the size of a deck of cards. A serving of pasta is around one cup. Have a salad with lunch and dinner to help fill you up, but use the salad dressing spritzers to save points. Eat lots of fruits and vegetables, and drink lots of water (in fact, get rid of diet sodas, juices and other unnecessary drinks).
Find foods that are satisfying, that have high protein counts. I love the Kashi snack bars. They fill me for hours because they have a lot of protein. Yogurts are also really good. Put a piece of gum in your mouth when you're about to emotional eat. Can't eat if there's gum in your mouth.
Finally, don't deprive yourself. WW is big on this and this is why WW works long-term. Treat yourself to a special meal one day a week or have a bit of your splurge item each day. Just try to find healthy options. For instance, if you love high-fat muffins, track down a low-fat recipe for the same thing and make your own. Love cake? Get the WW cake snack-size, which is super low in points.
Good luck! In addition to WW, also take a look at what Cooking Light has to offer on their website. Their recipes are wonderful and most are pretty low in WW points.