How can I find out how much my beanie babies are worth? And how/where could I sell them?
You can find out the value of your beanie babies from various collectors. Sadly, majority of the popular Beanie Babies are not selling for even close to the retail price that was paid for them. You can get some more insight on http://www.ehow.com/about_4610327_how-much-beanie-babies-worth.html.
They don't have much value, it will be hard getting what you paid for them. Try eBay, garage sale, donate.