Congratulations on your newborns, ABLACK2011 and MEGZY6001902!!!! Exciting!!! My advice is to start small, track your calories, if you are breastfeeding then you know you will need more calories. Then work in exercise as you can, maybe go on a walk together with baby in the stroller or attached to you, or exercise to a dvd or with home equipment while baby sleeps.
When my daughter was first born, she loved to go for walks either in the pack or in the stroller, she just loved being outside and it normally lead to a nap for her, while I got to destress and get some fresh air. The calories were hard for me to track when I was breastfeeding as I was so worried I wouldnt eat enough and my supply would go down. Remember to drink lots of water!!
You guys can do this!!! Good Luck!!!