1. I feed mine the same as i feed my other parrots. Mix veggies, fruit, rice, pasta, millet and some seed. Sometimes part of a boiled egg with shell.
2. I would go to your vet or find your local parrot club and have one of them show you how to wing clip.
3. I would wait at least 48 hours. But some people say not too. Here is a good website with a well written guide to taming a budgie.
http://www.lisashea.com/petinfo/articles/bird_hand.html
Hope that helps some.