If you don't know how to start exercising and what to do, maybe get some kind of DVD program (I'm a huge fan of Turbo Fire for example but there are so many that are all great) or go to some fitness or dance classes at local gyms or dance studios to get moving and have some fun!
Also walking more is really good for you. Like parking a little further away from school for example and walking the rest of the way? Or taking the stairs instead of elevators. Or go to further away rest rooms during the day. All these things are great way to add more activity to your day without taking extra time. And stuff like walking is something you could do with your daughter in the stroller as well! I'm sure she'd really enjoy exploring the world outside
Other than that.. haha well try to explore how you could eat a little healthier and use less fat to cook? More fresh fruit and veggies and smaller portions of fatty foods maybe? I love making fruit smoothies with a bunch of spinach in there (you can't even taste it!!) - they're super filling, yummy and really great for you.
Just a few ideas for you. Welcome here and yay for starting your journey