How do I change the power steering pump? What tools will I need? How much fluid goes back in?

It is not very hard as they are usually accessable on most cars.
Belwo is a link to walk you through replacing a pump and the parts and tool you will need.
Paste link into browser. When you get to link you might do a site search and find other past questions to help you. I could not find an archived pump replacement Q&A for your car.

Here is th elink;

https://www.2carpros.com/articles/how-to-replace-a-power-steering-pump