we did the same exact thing as you, got a new pup when one was a year old but we started with a female. seemed like a good time. she was already in advanced training classes so teaching him things like sit, down, stay, come was a lot easier 'cause he watches her. i really can't think of anything we did wrong, everything worked out great. they were playing like best buds immediately. we brought the older one to the airport to get the pup so they met each other outside of the house.
just make sure you social the crap out of your dog with other dogs so you know he gets along with other dogs. good luck. ours went with my wife to her job at a doggy day care place so she played with other dogs 8 hours everyday.