Make sure he has a BIG cage with a lot of floor area as these are active snakes. I'd give him a warm spot of about 85 F and a cool end around 70 F. Make sure there are ample hiding spots. At 3-4' he can probably handle adult mice but I wouldn't feed him anything larger than that because these snakes are not constrictors. They rely on jaw strength and a pinning method to overpower prey. Don't handle him for awhile after you receive him because these snakes are easily stressed. You may want to consider having him dewormed by a vet. A coachwhip is the exact opposite of a boa. Feed frequently, maybe 2-3 times a week (small meals).