One step at a time. Replace the fuel filter. You can use a flashing spark checker placed on a spark plug wire to check for spark. There should be a spark about every two seconds during cranking. 'NOID test lamps are great for test to see if the fuel injectors are getting orders to spray fuel.
You can get an indication of a fuel problem preventing start by using a spray starting fluid in the air intake tube on top of the engine. If it starts, troubleshoot the fuel system.
There is really no substitute for a fuel pressure test gauge. If fuel pressure is off 5 psi, the engine might not start. If you need an adapter for the fuel line connection, you can get one from ebay or amazon.com.