Fuel, spark, compression. Either of these missing will give you a problem. With the engine off, pull off a sparkplug wire, insert a phillips head screwdriver into the connector inside the boot and hold the handle while someone cranks the engine, be prepared if the engine should start unexpectedly. You should see a nice blue spark jump from the shank of the screwdriver when you bring it near a ground (metal that is not insulated from the chassis), If that works, with the engine off, slowly loosen the fuel pipe at the fuel distributor to your cold start injector, If it sprays fuel, you probably had fuel pressure prior to loosening it. If you have fuel pressure, check the compression in all cylinders.

Of course there are more precise ways to measure all of this; these are just some down and dirty suggestions.

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88 300e
89 300e
93 400e
93 500e
77 308 GTB