Start with the basics, check the plug wire and make sure they are going to the right place, first and foremost, if it is turning over and no fire. if it won't do anything check all the wires going to the starter, test, test, test before you do anything.
Check battery to make sure that's not the problem. Make sure the engine is getting power to the starter. unless of course the idiot just put the motor in and didn't connect the harness to the engine. Not the way I would do it, but hey it would surprise you to see some of the things I have run into after buying a car/truck or anything with an engine.
If it has not been running, think in storage for a few years drain all the fluids, gas, oil, trany fluids, and don't forget the turn signal fluid, that's an important one.
Looks like you have a good winter project ahead of you.
Technology is great when it works,
and one big pain in the ass when it doesn't
Detroit iron rules all the rest are just toys.