Have you thought about eBay, this way you can reach people all over the country or world.
The department 56 items I would most definitely put on eBay, they are collectable, and there are lots of people working on their collections, especially if the piece is retired. I had a 2 of the same piece Yankee candle Halloween Skelton Hand. I put it on eBay on auction, and it sold for 68.00 dollars plus shipping, I had only paid around 10.00 for each of them, I bought them after Halloween.
As far as the cookbooks, I would do some research on eBay and see if you have any that are hard to find, also check out the book rate at your post office so you know how much to charge for shipping. If you list them on Craig's list, meet in a crowded place with your husband with you never go alone. On another thought. If you have a antique mall near you, you might want to go and see if one of dealers might want to buy them.
You could donate them to your local library, and use it as a tax deduction.