Go through the obvious questions first, we've all done it, even if it's true you don't have to tell us and embarrass yourself online but does it have fuel??
Check for spark by pulling a plug wire off the coil and hold it really close to back on again while someone cranks it and watch/listen for the spark (best done at night)
Stand at rear of car and have your head close to the gas tank, have someone else turn the ignition to on but not crank it, you should hear the pump whine for a second as it primes itself, if not it's dead, or the inertia switch in the trunk has tripped, it's located on the left side in the trunk behind the side panel trim, press down on the button, if it does not move that's not the problem.
04 3.9l Convertible- Daily driver
94 5.0l Convertible- Work in progress
92 5.0l Hatchback- Another work in progress