Car won't start

I would think the plug wires go to a distributor with an ignition module , you can test or replace that , then on to the coils , you can test or replace them , see if they are getting juice , there may be a relay involved , basically start from one end and work towards another , without seeing the car/being familiar with /or wiring diagram I don't know . If you don't have a multi tester to see if things work buying parts that don't fix the problem can be as much as taking it to a garage .