It's a process of elimination. Start with two questions:

1. Are you getting spark? If your timing light is flashing, you're getting spark.

2. Are you getting fuel? Pull a plug and see if it's wet. Look down the throttle body and see if it's wet.

What you find will provide a clue to the next step.

If you have both fuel and spark, check the "set your timing thread" in ProZ's post. If not, start checking back down the spark or fuel path - whichever you're missing.