I subscribe to Shape magazine because it is a frivolous treat but gives me new ideas and motivation each month when I get it in the mail.
I prefer to use DVDs or equipment at home since I can't afford a gym membership (time or $$). It is hard with the kids, so I like the 10 Minute Solutions since the workouts are complete and only 10 minutes each, or you can build with more than one. I find DVDs easier for getting into a workout full-swing than trying to do a complete workout on my own. I also like Jennifer Nicole Lee's DVDs since they are mom-motivating but they are 30 minute workouts. I bought a used exercise step from someone and that is a nice extra piece of equipment, but you can also jog up and down your own steps.
I used to get home from work, change, nurse the baby (in your case, make sure she's not hungry), put him in a bouncy in front of me (or make sure she's contained and can watch you or napping), and workout for 30 minutes, then shower. If I did that immediately after work I still had most of my evening left. Now that I've got my third and my oldest is 4 1/2, it is not safe for me to workout when they're awake (they get in the way, get hit with dumbbells, hit each other with dumbbells, trip me, etc.), and I get so little sleep I'm not waking up early, I plan on going back to lunch break workouts. I get an hour so will be running/walking on my lunch breaks for 20 or 30 minutes, wiping off in the bathroom (spit bath!), and then taking 20 or 30 more minutes to pump and eat lunch.
I have to plan my food at the beginning of the day. My snacks are for work only, plus an after dinner snack (we're up really late at night so I need to eat again). Most people suggest not eating within a few hours of bedtime. I also eat breakfast and some half-breakfasts throughout the morning (yogurt at home, a breakfast bar or carrots or something in the car, oatmeal mid-morning at work, etc.). High protein breakfasts are also helpful. Watch your portions but I find it most helpful to load up on fruits and veggies. It is painful when you're in the checkout line, but worth it. Good luck! I'm about to start working on that, too.