Not a huge amount, unfortunately. I'd say you could get more for the lenses and flash if you sold them individually. The carcass is unfortunately not worth a great deal. It's not good or old enough to be 'cool',
If you've got a DSLR, I'd suggest hanging on to the lenses and filters. You won't get enough from them to buy anything that's better. The Canon 50mm prime will probably be a very good lens, too.