What BruiseLee said is pretty much it, the smaller lots you sell them in the more time and trouble you're going to have to spend and you will probably find some will be hard to move.

if you're looking for price ideas, looking the item up on eBay and then filtering for Sold results will give you an idea of what people are willing to pay. if you're looking to move things in a hurry however you'll probably want to knock a few % off whatever the average sale value is on there.

Given that you're looking to sell your collection, I'd recommend emailing the admin and seeing if they are happy for you to set up a dedicated thread in the sales section to list items for sale.