The best advice I can give is for you to research the different weight loss plans to see which one fits you best. There is tons of info on this forum (and elsewhere on the net) if you take some time to read the different posting areas. Find a plan you like and dedicate yourself to it. Make small goals for yourself as well as a large one...plan what your reward will be when you acheive your goal...a spa day or a new outfit or something fun...
Exercise is just as important as what you are eating...you can lose weight by simply cutting down on what you eat - but it will be slower and you won't have a toned body when you get to goal. It's also important to build the hrealth habit of exercise to make sure you can maintain your loss for the rest of your life.
66 lbs is a lot of weight to lose but it CAN be done...and YOU CAN DO IT!!!!! Feel free to ask for advice - educating yourself on what is good for you is a big part of the battle.