With such a brief description of the problem (won’t start) it’s impossible to diagnose cause, OP needs to state the history of the fault, what led up to it, and what made him think he could just throw parts at it and hope for the best?
Basics:
Does it have spark?
Does it have fuel coming out the injectors?
Does it have compression?
Is the valve timing correct?
Is the spark timing correct?
Is the starter cranking speed fast?
Is the battery fully charged?
Is the charging system working?
Start testing these items and get back to us.