Help with Microsoft Access

I need help with queries to create on Microsoft Access for my homework. I have made a database about a vet clinic. I need queries to run about animals, staff members or customers that go to the clinic. Can anyone please give me any ideas? For example, one of my queries is a list of the members of staff who are on 24 hour call to help animals.

You can query things like staff members who work with specific types of animals, or staff members who make over a certain annual salary or hourly wage, or who have worked there longer than X years, etc.

I cant include the staff wage in the database so any other queries would be very helpful. Thanks.