Don't try to handle him for the first 3 days. After the first 3 days limit the initial play periods to 15 minutes with long intervals of rest in-between play periods. Obtain a book on taming and training. You will need to finger tame him, and teach him the up command. Cockatiels are not great talkers, but can learn a few words and phrases.
Some cockatiels are better talkers than others.
If you can't afford a good size cage you can't afford a cockatiel. The wires should be a thick wire and run horizontally. Cockatiels enjoy climbing up their cage. Any bigger poses a safety risk. Their little heads can get stuck.