Congrats on your two littles! Being a mama is the best!
I had my daughter 5 months ago & I researched a ton before I decided on a diet plan. The best thing to do while you're breastfeeding is to eat between 1500 & 1800 calories a day. Your body will adjust to this decrease & your milk supply won't suffer.
I'll give you a quick look at a sample of what I eat for a day just to give you an idea...
Breakfast: Omelet (1 egg, 1/3 cup All Whites egg whites, ham & cheese): 227 calories
Snack: Fiber One Bar: 130 **Beware the 400lb man farts from these

Lunch: Turkey melt on Rye bread with swiss cheese: 255
Snack: Slim Fast bar: 170
Dinner: a 300 calorie chicken recipe (allrecipes.com or sparkpeople.com) with a veggie
Snack: a glass of chocolate milk: 130
And this is bad, but it works...I allow for 2 Dr Pepper's a day which is 300 calories.
I stay between 1600 & 1700 calories a day. I started at 1900 & moved from there after the holidays, and have lost 2lbs this week. AND I've had no problems with milk supply.
HTH!! Sorry it was so long!