Hi and Welcome, you've been given some good advise already.
I'd like to add just a couple things. First off, Only spend as much time now with your bird as you think you'll be able to spend with him for the next 30 years. So in other words don't shower him with lots and lots of attention now while he's new, and then start spending less time with him as the "new" wears off. If he learns that you can only spend a couple of hours with him now, then if your work schedule changes or something then it won't be such a shock to him. Also don't go running to him every time he makes a noise. Answer him with a whistle or just talk to him from a far. Other wise he's training you to come running and being a flock animal they prefer to be with you as away from you so they'll do what ever they can to be near you...screaming to get your attention.
While you have him out and are playing with him is the time to start teaching him how to play with his foot toys and learning to search for food to keep himself occupied through out the day when you aren't around.
Also, if you haven't purchased the book...A guide to Quaker Parrots by Mattie Sue Athon you might want to do that. Its a book full of valuable information that you'll keep referring back to often I'm sure.
Something else you can do to help the screaming not start is to locate his cage in such an area where he can see what's going on in the house most of the time, so he doesn't feel isolated. Let him have out of cage time but not necessarily on you; just him playing on his cage etc.
Also, make sure you have him on a well balanced diet consisting of pellets 50 - 70 % and the rest consisting of fresh fruits and veggies, legumes, pasta, cooked rice etc. Keep Seed as an occasional treat. Like when you want him to go back in the cage

And then only a very small amount at any given time.
And above all...Socialize, Socialize, Socialize, introduce him to as many people and things as you can. Hand him off to friends or have them go and pick him up off the cage etc. As was said, he's going to pick a favorite person and it may not be you...but just keep after him and you should have a very pleasant and happy bird for many years to come.
One other thing...to do with the flock calling and answering his flock call. Since its just you and your boyfriend I would suggest each of you having your own tune to whistle, to answer him with and when he starts calling when your out of the room only use your whistle...that way he'll learn who's there and who isn't.
Good luck and once again, welcome to the forum.