
First of all you have him hip-scored and elbow-scored through the KC/BVA scheme (your own vet should know how to take the x-rays, but the plates have to be sent away to be examined and scored), and with luck his score will be better than average. You also have him eye-tested by a specialist vet to try to determine whether he is suffering from any of the four (I believe) hereditary eye conditions that can afflict labradors.
And ideally you start showing him, because that is where the bitch owners will be, and you want them to know he's available! If they (and the judges) like what they see, then the bitch owners will approach you and ask if they can use him.
Hope this helps.
:)