alot of universal remotes wont work with samsung. But you can get an origional samsung remote or the samsung universal remote that will work your tv at this link. They are actually less exspensive than most generic remotes and have free shipping. http://servicemanuals.vstore.ca/
I don't have a good understanding of such things but the Firestick is a digital device that can only be used with a tv that provides suitable digital inputs.
Such a tv would typically have sockets for USB, HDMI and internet connection as well as the more usual antenna and scart sockets.