Congratulations. From now on your life will not be your own, but that's ok. You'll be the daddy, head of the family, paterfamilias. You will suddenly be responsible for clothing and feeding all of you and not just yourself. It will be the most rewarding experience of your life. Remember to enjoy every moment of their growing up. Very soon they will have grown out of sandcastles on the beach and you'll be lying awake wondering what time they'll come home. Then one day they'll be looking after you. Don't be too busy working, make time for your family, nothing else is more important.
Good luck!