As a person who LUVs to cook and host (just cooked & hosted a Chinese New Year Party for 50 people on Sunday) I HIGHLY recommend The Joy of Cooking. This is the bible of cooking... Anything and everything you need to know about cooking is there. Granted as you become better, you can tweak the recipes to your liking however this is the best book for beginners (it was mine!). You will learn so much!!!
Let me know if you need any more info & congrats on your twins!!!