I got my first job recently at Wendy's. Can someone answer my questions about what to do when I get there?

Saturday will be my third day working. Yesterday I learned how to do the fry station and how to clock in and such. My biggest question is if I need to go to the manager every time I go in so I can be told what to do or do I just do something? I’m not quite sure and I don’t want to mess up my first job or anything. Also, do I clock in before I talk to the manager or when she tells me to? Just doing anything really makes me nervous honestly….