You say " nothing is working " ?
Did you change fuel filter because,,the car was not getting fuel,,somebody told you to,,it seemed like a good idea ?
Your car needs 3 things to operare,,fuel,,spark,,compression.
To check for fuel,,turn the engine over 5-6 times and remove a spark plug,,any plug,,if car is getting fuel,then the plug will be wet and smell of gasoline,,if pug is dry and does not smell of gas,,then you may have a fuel problem.
To check for spark,,pull a spark plug boot off,,and take the same plug you used to check for fuel and stick it into the boot,,place the plug against the engine,,and have a friend turn the engine over,,you should see a bright blue spark jump the gap,,if the spark is yellow,,or there is no spark,,then you know you have an ignition problem.
Now that the spark plug is out of the spark plug hole,,you can screw the compression guage in and check the compression,,turn the engine over 3-5 times,,the guage should indicate between 125-200 psi.
You should check for spark on each plug wire,,and check compression on each cylinder.
If you can get a hold of an OBD scanner then you should check for stored diagnostic codes too.