First, I would suggest myfitnesspal.com or a similar website. Great way for tracking your calories and exercise, and it will give you a pretty good idea of how much you should be eating based on your age, goals, activity level, etc. It's also a great support community.
Then get rid of all the junk in your house. Chips, candy, microwave popcorn, soda, etc need to go. Stock up on fresh veggies, they make great snacks (especially if they're already pre-cut and ready to eat). And while you're at it, buy a water bottle (ideally one that holds 16-32 oz). Keep this with you through the day and into the evening and drink regularly (you should be having at least 64 oz a day, probably more). We often mistake thirst for cravings, so this will help cut down on the snacking.
Buy a sugarfree gum you like, and chew that first when you know you shouldn't be hungry but find yourself wanting something in your mouth.
Give yourself a rule that you only eat at the table. Not in front of the t.v. (as you've found, this leads to mindless snacking and before you know it you've eaten a ton of empty calories).
Next, go to the library and find some exercise DVDs. Anything that gets you moving is good, but I've heard really good stuff about Shred, and I always loved Tae Bo. Once you've found something you like, you can think about buying it, but the library is a risk-free way to try different things. (If you have Netflix, they have a bunch too, and many even on instant play). Oh, and you have to actually do the workout with the videos to get the benefits, LOL.
Last, don't try to lose too much at once. 2 lbs a week is reasonable, especially for someone needing to lose a lot (which isn't you). 1 lb a week might be a better, more manageable goal. Anything more than 2 lbs a week can be dangerous, especially if you only need to lose 10 lbs total, and it is a lifestyle (and weightloss) that is very hard to maintain.