Welcome to you both! Good to see you here.
Cling: you have a great plan set up for yourself. You can do. Remeber, it's one day, or even one meal/craving at a time. Keep slogging through it, don't give up. Post here often, ask questions, and be involved in your own weight loss!
Gretchen: I am also 34, and a mom (not single, but sometimes it feels like it!) I find swimming is a wonderful exercise for me. The water supports my body weight and I can actually get moving enough to increase my heartrate. After, I sit in the hot tub to relax my muscles/joints. Bring your son with you - have some fun throwing him around in the water (great upper body move!) You'll have motivation galore if you do - he'll want to go again and again because it was fun, (how can you say no?) and you get to bond together.
Anyways, welcome. Explore the forums, make yourself at home. We have got some work to do!