Changing text in fixed text box

Hi, I want to mimic a Rise scenario by creating it in Storyline and importing it into a Storyline block in Rise.
Setup: 10 slides (or layers), each with another background image. The text box and the 'next' button must stay in place. So the only things that must change are the text within the text box and the background image. 
Should I create separate layers and separate statuses for the text box?
And what about the 'next' button on the baseline layer? I can't seem to add a trigger to it when showing another layer? Thanks for helping out. Dirk