Monica, welcome to the beach!
I must admit, though I totally understand your enthusiasm, that you will be better set up for success if you give yourself a week before starting. Use that week to read the book thoroughly, ask questions here, read our FAQ carefully, toss out all of the bad food in your house, research recipes (use our recipe forum for great ideas!) and shop for lots of delicious OP food. This will set you up for success and make Phase 1 a breeze. Think about it, okay?
If you search for shopping and Phase 1, you'll find several threads in the forum that tell you more about what to buy. I'll see if I can bump one of them up for you, okay?
Congrats on making a great, healthy decision for you and your kids!