I feel like there is nooo rules on what blush to wear wit red lips. It all depends on what look you're going for and preference. I've used sweet as cocoa, razin, dollymix and pinch me, so try a bronzer, a pink or a plummy colors.
I dunno, I never thought of this before, I think I kinda just wing it... But looking at my pics it seems like I sculpt my face rather than apply blush...