Check to see if you have 12v down the exciter wire to the starter motor to start with, If not work your way back making sure you have voltage to the ignition switch to the alarm (if you have one).
Double check basics Ie: fuel lines are the right way around, injectors are plugged in properly, coil pack(s) and ignitor are plugged in correctly, plus check cam and crank angle sensors as ECU needs this info to start engine.