I would recommend keeping a food journal. That way you can see where you are getting most of your food calories from. And then once you have an average week to look at you can try and see where you need improvement= more veggies, less soda/junk food, more lean protein, more whole grains.
As far as activity. I've been hearing the recommendation a lot to wear a pedometer. I got one at Target for $5. And then aim for 10,000 steps a day. It's easier than you think. Pace while talking on the phone, take a lap around the office every once in a while. Take the long way to the bus stop, or use the stairs instead of the elevator. You know just little ways to increase your activity. Or even doing 10 minute bursts of exercise a few times a day.
I don't know what your home schedule is (kids/etc). But I will do an exercise tape with my kids in the room. And they will follow me and do it too. Sometimes it's a pain, they get in the way. But we are all together. Or we go play in the yard. Or go for a walk together.
Good luck! I'm sure you will get lots of advice from savvy people here!