I dont know much about birds but I think they dont talk untill they are older. Im shure you could call up whoever you got it from and ask them at what age and how to start or try getting a book about parrots.
We have 1 African Grey, 1 Cockatoo, 1 Conure, 2 Adult lovebirds und 3 of their babies (the only ones they ever had)and 1 chicken.
We just talked to them like, "pretty bird", "what you're doing?" stuff like that.
The African Grey Smoky picked up the best, he says for example "Do you want cola?", "Benji (our dog) move", "Beamer (our conure) shut up", "you lost your mind" and so on.
The Cockatoo Casper says for example "What you're doing?", "night, night", "bye, bye" or he says his name like he is dying. He is pretty funny.
Our Conure Beamer says for example "pretty, pretty (about 10 times) bird" and my husband tought him to say "a.. h...", which I didn't care for and he thinks it's funny.
By the way the previous posters are correct, our birds started talking more when they were around 1 year old and our grey is getting really good at it. He is now 4 years old. The Cockatoo mumbles a lot too and you can hear one word like "food" and the rest is mumbled.