A hole?
In gyproc (plasterboard) you need something to fill the whole with.
Either do the old screw in a bit of gyproc, or you can use one of those 'Vol...' something, patchup doo da's.
Or just do the auld patch and repair, whith the gyproc, whith some muck behind it.
Lwt it set, then fill it.
I dunno what kinda plastering skills you have.