The firing order is 1-8-7-2-6-5-4-3.
Cylinder numbering is typically done from the driver's side (left) front to the back, then repeating on the passenger's side (right). However, to be absolutely certain, you should consult a repair manual or a diagram specific to the 6.0L Power Stroke engine for precise cylinder location numbering. Many online resources, such as diagrams from parts suppliers, show this clearly. There might be slight variations in how exactly a diagram labels the cylinders in online images, so it is best to reference a service manual for accuracy.
