Most aftermarket bumper covers I've seen have way to many openings and grills. You want to close off the front of the car as much as possible and get it as close to the ground as possible, and it will be much cheaper to do that with something readily available and disposable like lawn edging. Same for side skirts; I wouldn't waste hundreds of dollars on aftermarket skirts for questionable results. Here's what I've done with lawn edging on my car, $7 for a 40-foot roll at Wally World:
Vinyl wrap won't affect drag;
this has been tunnel tested. "Contrary to what you may read on your favorite message board, well-waxed, smooth paint is no more aerodynamic than the worst spray-can, flat-black primer job you can imagine."