2. This website shows you how to access grades (assuming your students granted you access): https://drive.google.com/file/d/1zdYiVzxqF-hxQnllAqIPWMCzkDO-x_eE/view
3. If you discover your students have not given you grade access in Workday yet, they can do so following these instructions: https://drive.google.com/file/d/1GPndXdUZmD7R9jqYgUOePjQTeMa7wZJr/view (while the jobaid starts by talking about granting access to financials, if you keep reading it will show academic info).
Hope this gives you what you need to get started. All best to you and yours