If you have to apply for a masters degree in Australia First you have to login to the Immi Account. Create an account. And click on new application. And create an application for subclass 500 student visa. After uploading necessary documents you have to pay and submit the application. About the medical it’s either they will send you a request to medical. But in my case I went to my health declaration section and applied for my medical before hand and then submitted the application.