Congratulations on your new conures! It's hard to have just one!

Make sure you take some

when you can!
Try to keep their cages in different rooms for quarentine. Even if your new conures passed a veterinary exam, they still could be carrying a sickness that could infect Moki. This not only keeps everyone healthy, but is also allows Moki to get used to your new sun's at a distance.
As far as introducing them, let them go at their own pace. They may have a few squabbles at first, but as long as no one is getting hurt, you can let them work it out.