Examples
Open your best splash photo
Choose the Crop Tool and then go up to the top and pull down to 8.5x11 size crop
Hit Done
Do Levels if you haven't yet.
You may use Hue and Saturation Adjustment and choose Colorize if you want a tint to your cover.
Choose the Type tool and add a title to your cover.
Download the black or white barcode below.
File>Place Embedded and add the barcode (don't touch the edges of the magazine cover)
File>Save a Copy as a JPEG
White Barcode
Black Barcode