First day of work help?

So I’m starting training today at my first job (grocery store) but I wasn’t told who I was training with. I also am supposed to get my shirt to wear today. Do I just clock in and then go ask for my shirt and who I work with at the front desk? I was told a could wear a shirt for a specific sports team since they play today but I don’t own one so I do need to change into the shirt I assume. I also need to know how often to check the schedule but when should I and who should I ask and who do I ask to see it?