I agree with Lorraine 100%. In that type of environment there is no way I would let him out on his own. He may have always been indoor/outdoor but not under these conditions and he won't know how to handle it. Harness and leash with supervision would be the only way I would ever let him outside. I'm sure he will drive you crazy for awhile wanting out but he will adjust. I have gone through this with several of mine and eventually everyone got used to the idea. It takes time and patience but it will happen. If it's at all possible could you build him an outdoor enclosure that would be safe from predetors?
Those would be the only conditions I would allow him to go outside. I'm afraid that he would come up missing really soon if you didn't keep him in. It's happened to many because of dogs, coyotes, and other wild animals.