Once you have your helper it's time to start cleaning! Don't worry about making a mess it's more fun that way. Start by making piles on the floor: keep/store, giveaway [aka gift basket], donate and throwaway.
Start with blankets. When you add a blanket it will help create height for the other items. Next, start arranging the items one-by-one. [Tip: roll clothing items]
Don't forget to include extra diapers, bottles, toys, socks/shoes, hangers, etc. Maybe even a bottle of wine ;)