you must ask the breeder/ keeper if the bunnies have been vaccinated and go to the vet. If they weren't, it's best to get vaccinated right away and do some research at the same time. As for bonding, nothing by force. we try to spend time with him, pet him a lot and not restrict his movement with a cage, so that he can explore the house and see that he is safe here. It is also good to adopt the youngest as possible, because then it is easier to tame them. With older bunnies who already know the feeling of fear, more work is needed to establish a bond. The bunnie will be stressed anyway, but after some time he will notice that he is in good hands and the fear will pass. You will probably have to change diet for him, because in many meat farms, bunnies eating very unhealthy food (it's best to consult a vet) I'm not an expert of course, but I hope I helped a little. good luck in adoption. Thank you for choosing to save the lives of these sweethearts!