Peace be upon you. This is my first time raising cockatiels, and I feel they need care and attention to every detail. It's their first day with me, and they are approximately 4 months old. (When should I start taming and training them? When should I introduce a healthy diet system including vegetables, fruits, and legumes? + What is the best healthy food for them? Should I start giving it to them on their first day, or after they get used to me?) I hope you can advise me. I want them to be good, productive, and healthy.