help me interpret a pattern please
 

When a pattern asks you to finish with a "wrong side" row, does it mean to complete a WS row or finish the right side and have the WS waiting to be worked on?

Hi, and welcome!

I always take that instruction to mean that the last row you work will be a wrong side row. So you would start with a right side row for the next set of instructions.

Just to be sure, I always look at the next instruction for guidance. If the pattern instructions call for a RS row, I make sure the last one I do is a WS row, and vice versa. My default though is if it tells me to finish with WS facing, I work the WS row, leaving it ready for a RS row.