I would start them out in
separate cages, sitting next to each other. This will give them each their own space but still allow them to see each other. As they grow more accustomed to each other you'll see them sitting side by side, although each in its own cage. When they start doing this you might try putting them in together and see what happens. There may still be a bit of a problem with "pecking order", or they may just be thrilled to see each other. When they start preening each other you'll know you've got it made! Ideally you would have a third cage so that you would not be moving one bird into the other one's territory, but I realize this isn't an ideal world and not everybody has a garage full of bird cages like I do!
Good luck with them - let me know what happens.