YO sally,
welcome!
First, sorry about Caps! am having vision issues now and hunt & peck is the Norm for me.
REAL FAST AND SIMPLE CHECKS FIRST;
DOES HORN HONK AS USUAL, LOUD OR JUST A WHIMPER BEEP);
if NOT, CHECK BATTERY VOLTAGE; OR GET A JUMP
SAME FOR HEADLIGHTS; ARE THEY bRIGHT AS USUAL? OR DIM?
Is IGN KEY CYLINDER LOOSE IN cOLUMN?
Detailed Testing
How to Troubleshoot a No Start
(Ford 4.9L, 5.0L, 5.8L)
http://troubleshootmyvehicle.com/ford/4.9L-5.0L-5.8L/how-to-troubleshoot-a-no-start-1
Can borrow a spark tester at some parts stores or diy; google it