Hello Hannah_Rae
A baby CAG will begin talking a few words by the time it is fully weaned, such as hello. The more time you invest and create a bond with the bird the better the bird will be. At the age of one the bird will be talking up a storm providing you are spending time with it. The more you repeat the word or phrase the faster the bird will repeat it. Be careful what you say. You will see your bird trying to say a word then in a few days out it will come. After the age of two you won't be able to shut him/her up, CAG are NOT suitable for apartment living as they will make loud noises and whisles and cat calls will be one of the first that he/she will do.
As far as food goes they will eat preaty much the same food as you will, and probably you will be eating more healthier since they require fresh fruit & vegetables daily. They will even eat chicken, I know that just does not sound right but they enjoy it. You can check out the site under bird food for other ideas. Also look into safe wood and plants for around the house, Avacodos, chocolate, alchol, apple seeds and other fruit pits are posionous for the birds.
Have a great week.
Benny