Did you do the valve ajustment? If you did not do the Valve adjustment step by step getting each valve right then most likely all or some of the valves are to tight. That would cause a lack of compression and your car would not start. Does the engine "sound right" when its cranking. If it seems like its spinning to fast or it changes sound that might indicate only some of the valves are out of adjustment.

My guess is since you are not sure what valve adjustment is you did not do it right. I am not typing out the step by step process, Buy a manual.

Edit: I got this fron Autozones repair guide
V6 ENGINES

"With the engine on the number 1 firing position, exhaust valves 1, 2 and 3 and intake valves 1, 5 and 6 may be adjusted. Back out the adjusting nut until lash is felt at the pushrod. Tighten the adjusting nut until all lash is removed, then tighten the nut an additional 1 1 / 2 turns to center the lifter plunger. Turn the engine one revolution until the "0" timing mark is once again aligned. Exhaust valves 4, 5 and 6 and intake valves 2, 3 and 4 may be adjusted"

If the car sounds fine while its cranking you want to check to see if you have spark. Any auto parts store should have an inline spark tester. If you do not want buy a tester just hold the plug end of the wire and lean against the car and have a buddy try and start it. If it welds your ziper to the fender your good. If it just makes you jump and swear its not strong enough.

 

Hahaha..that sounds like a pretty accurate way to test spark..