What do I need for winter track at my high school?

So I'm doing winter track at my high school and I don't know what I need. I know I need running sneakers and 'layers' (it can get cold here). Other than that, I don't know what I'll need. I see people carrying duffel bags for track but I don't know whats inside the bag...this is the first time I'm doing any kind of track. There will be meets and practice every night. So what do I need for track and what do I put in my duffel bag? Thanks.