How exciting!
Let's see...whelping kits....cotton balls, alcohol, gloves, scissors, thread/wax-free floss, heating pad (got mine off of eBay...but any pad will do), lots of towels/paper towels, a puppy scale, iodine, a box with towels and heating pad turned on but underneath the box for pups, trashcan with trashbag...can't think of anything else...