Thanks for the infoUnfortunately, there are a number of things that will cause a no-start condition in a 6.0L.
You really do need to get the codes read OR you could begin some troubleshooting of your own.
Here is a no-start thread to look over:
Troubleshooting a No-Start condition - Ford Truck Enthusiasts Forums
if you plan on owning that truck for awhile. look into buyign Auto Enginuity it is a scan tool software for you laptop and will let you monitor all of your trucks paramaters and will make it simple to troublshoot. It only cost around $350 and can be hooked up to any ford with OBD2 and you can also buy other packages to hook up to other brands. its well worth it and will pay itself off in no time