Stock springs in the rear. The new front shocks will come with their own springs.
The front CAN come with their own springs, depending on your wallet
You can buy a complete front setup with shocks/springs or you can just buy new shock (and use your stock springs)
http://www.stage3motorsports.com/2015-F150-Leveling-Kits.html
$200-$250 for new front shocks
$800-$2000 for new front shocks w/ coils