re: Should I try to trade for a better #1 WR? / Which WRs to start?

The fact that you were able to get Colston or V Jax in the 5th is a heck of a steal. I would be thrilled with your lineup. Everyone is going to have at least one questionable spot week 1. I would go with the most proven guy or guy you know is a lock for plenty touches.

Do I go Mendenhall at the flex. I may actually start Nelson at my WR, but he has been hurt most of the preseason and they are playing the 49ers. So with him your hoping that A Rodgers has a big day. Mendenhall is a starter and will get his carries. Now what he does with those touches is another story. Hope that helps