I can't find my Trash folder on my Mac — it isn't on my Dock and I really don't know where to find it. I'm new to OS X. Does anyone know where I can find my Trash? I can put items in my Trash, but I want to empty some files not all of the files that are in there.
I think you should first use
killall Dock using Terminal.
This will reset your dock. If this doesn't work then you should download a 3rd party application such as DragThing.
Then logout and log back in, and start using DragThing.
If you need more help you can go on these websites : http://mac.bigresource.com/OS-X-Leopard-System-and-Trash-icons-gone-from-dock--t9R58eDJO.html