Tv Credits Scroller

What I am trying to do is have a vertical scroller (Tv Credits) where when one item for my array goes off screen and the next pops up. And if it reaches the end of the array it starts again.

I am pretty stumped as to how to make something move and scroll by itself with no input.

I can make things scroll with button presses but not with a timer. I cant seem to grasp the set Interval commands or anything like that.

I aim to add speed controls and by decreasing speed make it reverse in future. But getting it to scroll in the first place is my main aim.

Any help would be great thank you.