Winter semester

Hey so I’m just finishing up my 1st semester and i will be coming back for the winter semester for the 2nd semester for my program. Im a bit lost on how this works since i got a email telling me to select my course block but when i follow the steps it doesn’t show any course block does anyone know why it does that? My 1st semester was an assigned schedule so how would I know if this winter schedule is gonna be assigned or i get to make a custom one?