Congratulations on the birth of your first child -- how marvelous! I have two kids myself, and I am a personal trainer, so I have lots of advice to offer, although I really recommend that you speak to your doctor!!
I have to respectfully disagree with the previous posters. The first thing is to take it easy on yourself. You just gave birth!! Your body has been through a tremendous stress and your hormones are going wild. Give it time. Enjoy these first few weeks with your newborn and don't start thinking about losing anything for at least 6 weeks -- you really need time to recover. For now, focus on getting enough rest, eating the most nutriontally-dense food that you can, and moving when you can. Take the baby for a stroll or do some stretching to shake off the aches. Once your body has had a chance to recover from the shock of birth, then you can start cutting calories or doing intense activities. But don't rush it, because really there is no hurry.
The best advice for new mothers is to breastfeed if you can. This is nature's way of taking care of the weight for you. With both of my children I didn't have to workout to drop below my pre-pregnancy weight simply by breastfeeding. It took about 6 months with each, and it was so easy.
You'll be fine! Welcome to the forum! I encourage you to read about healthy ways to maintain your weight so that you have good advice to follow when your body is ready to take it on.
Best wishes!
Krista