first things i would check is fuel and spark, spark is easy you can get a spark tester from any auto parts store there easy to use and cheep, or you can just use a spark plug, put the coil on the tester or plug, turn the bike over and watch for spark, make sure the other coils are disconnected don’t want an accidental startup, repeat for each coil, if your not getting spark on a couple of the coils you can use a volt / Ohm meter to test power to the coil and resistance thru the coil, the service manual should have the specs in it for this, as for fuel you can also test the injector leads and resistance in the injector with a meter, another way to check for fuel, you can run the bike for a bit pull the plugs if your not getting spark on a cylinder there should be a strong gas smell on that plug and it might be wet from the un-ignited fuel.