[Mia and Wickett]

Wickett has been home for a week now, he's 12 weeks old. I've got an Amazon parrot (Aztec) and I'm trying my best to introduce them. They both seem rather curious about each other, but I've got concerns.
Firstly, I never close his cage door because he likes hanging out on top of his cage instead of inside it. This means that he and Wickett can get rather close to each other if we don't keep an eye on them. Will be going to buy doggie gates to put around the cage to make it safer. But ideally, they'd get used to each other and just let each other be. Is it possible? Anyone else have a similar situation?
My second concern is bird food. Aztec is always dropping something or other on the floor, and Wickett is quick to get at it. Toys too. Thankfully the toys are dog safe. The food....I'm not sure about. The food is very high quality and is mainly oats and stuff. He also gets a bit of whatever we eat, and if he drops that Wickett is one happy guy. I asked my vet and he said that the bird food might give him indigestion. Have any of you guys dealt with this before? It's rather impossible to stop a bird from throwing food around, and so is stopping Wickett from running lightning speed to get his little stolen morsel of yummy food.

Thanks for your help!!