C.A.
Oh, lucky you! Cockatiels are my favorite birds. They love attention and the more you interact the happier and friendlier your bird will be. Start by placing the bird in a small enclosed area, like a bathroom (toilet seat down). Get a perch from his cage and place it gently in front of his belly near his feet. If you press gently, the bird will step up onto the perch. Make his teaching session short but consistent. When he has mastered stepping onto the perch, you can try your forefinger. Use your forefinger like the perch.
When you and the bird are comfortable with each other, you can try petting him. Always pet from his neck down. If you go the other way (up) you are in the wrong directions of his feathers and he won't like it. My bird loved being scratched behind his neck. He would place his head down so that I could get a better job down for him.
Cockatiels love to be sprayed with water with a water bottle(once they are use to it). They will even lift up their wings to be sprayed under there.
Cockatiels love a variety of foods. They need a seed mixture that has a good variety of choices. The dish needs to be replaced daily as cockatiels will only eat the top layer. Not only do they need seeds but a selection of fruits will make your friend happy too. Cockatiels love to chew so putting orange tree branches and other chew toys are important.
Cockatiels can learn to mimick. They have CDs that play whistling tunes. I always played it while I was gone so the bird would have something to listen to while I was at school.
You want to watch out for drafts but at the same time you need to place his cage in a high interest area. If he is singing and you need him quiet put a blanket over him during this time.
The 'nose' of the cockatiel will tell you the sex when they are matured. Blue ceres are males and brown are females.
Have fun. If your bird is young, you should have a very long time with him, up to 25 years in some cases.