For settling in, the young ones seem to have no trouble at all. So most of your work is going to be ensuring his future happiness by getting him adjusted to new things now, while he's young.
Of course... I hand-reared mine so I suppose they were already used to me. But they are very resiliant birds and seem to take to change well.
Always have plenty of toys on hand. Try to switch them out and rearrange the cage every two weeks or so. This way he will be okay with new things in his environment and it helps keep him busy! They get bored with old toys, but if they disappear for a few weeks, it's new again!
If he's not playing with the toys- play with him. Most birds are interested in what we're doing and can learn from our example, especially at a young age.
Begin introducing him to new people and letting other be his perch. It's important to socialize these guys, so meeting new people is important. I like to hand Hane off to people and then he usually gets handed around the room (everyone adoring him and giving him lavish attention) before finally making it back to me. It's something he seems to enjoy too!
Step-ups now will help with future problems. When Hane is misbehaving I do a few 'ladder' step-ups (one hand to the next) and it calms him down right away.
And a variety of foods will help him gain weight and stay healthy. (Avoid junk foods. A tiny cheese-it is the size of your bird's head! Think we could eat like that and stay healthy?) He'll pretty much be able to eat everything he wants (that's healthy) until he's around two years old- ours seemed to stop growing at that point and didn't use the extra food for energy- a.k.a. began gaining extra weight. Until then, let him pig out on veggies and fruits. Veggies are more important than fruits. Our birds don't get any 'junk' food at all- their idea of a treat is a piece of fruit. ^_^
There's a lot more information just sitting here on the forums. And the search feature is extremely helpful too. I hope you enjoy it here and we look forward to many more posts and meeting your little one through pictures soon. ^_^