Mounting a print on a white mount board.

Hi ,I have just had a shot selected for an exhibition and need to have it printed and mounted on a white mount board between 5 and 8mm thick.I have never done this before.
What is a mount board?
Is it a special thing that the camera shop has or just coreflute or similar?
Also how do you stick the print to the board without ruining the print?Im such a noob. Please helpCheers