If you do let the bird out.be very careful about windows and mirrors:birds will fly straight into them.I have owned at least a dozen birds in the past 15 years or so. For a parakeet get this stuff:
1)Perches that are the right size for its tiny feet.Many people get the wrong size perches and that makes Tweety very uncomfortable.Try to get the perches that are shaped like branches,or hell, go outside and pick some branches and put them in the cage(If you do that make sure you inspect them for bugs.)The perches should not be too small where its claws can overlap the stick,nor should the perch be too big where its feet are flat on the perch.
2)Try to vary its diet. I give my parrots that I currently own,a pelletized diet and also give them fruit occasionally.There is a 50/50 split among bird owners and doctors as well over this.But it is real easy to clean up and the birds relly do seem to like it a lot.Try not to get the bird on an all seed diet.Pellets are probably your best bet.
3)Get it a decent sized cage.This is the number one mistake bird owners make.They do not realize that the little fellas need room.If your keet cant spread its wings inside its cage, then it is too small!
4)Birds also need light(No!) I keep my birds right up against a window facing the street and my neighbors are always whistling and talking to them.They love it. Also,during the warm months the birds get the advantage of having fresh air too.
5)Try to keep drafts off of the bird because a little bird like that can die from a warm or cold draft.
6)Some folks like to cover their birds up at night.I don't because my birds started to eat the damn towels I put around their cages.Very dangerous,because the fibers can get caught in their gut and kill them.
7)Keep its toenails trimmed.Try not to get the sandpaper perches they sell in the pet stores.I tried them on several differnt birds I had and they all seemed to develop pink callouses on their feet.I removed them and they went away.
8) If you are going to let the bird roam free when you are around,I would suggest keeping one of its wings trimmed.Why one?Well,if the bird gets spooked and takes flight,without any lift from its wings,it will get hurt or worse,killed if it fell hard to the ground.Keeping the lead feathers trimmed on one wing ensures a safe spiraling descent to the ground.
Sorry about the long reply,but I love birds and try to help out as many people I can when it comes to them.
Peace
Lounatik