I have contrasting views to almost all of you. I would place my bird in a compact cage about 30 inches dimensions from at least 2 sides, for the first couple of weeks or a month or two. The idea is to give the bird a secure place to sleep and spend most of his time outside the cage to get acclamatized and bonded with humans.
If you get a baby, sometimes they are prone to fall while sleeping so a small cage can easily be made fall proof or can take care of hard blows, also it urges the bird to come out of it as soon as you put your hand towards them so they will look forward to your company. A small cage can be easily shifted or placed anywhere according to both your and birds preferences. You can have a separate playgym to add to the variety. After some time you may decide how big a cage is needed for your bird.