How do I diagnose my 2000 manual honda accord 2.3l 4 cylinder?

Hello, Have you checked the level of fluid in the clutch master cylinder? If the clutch pedal is going to the floor, and the vehicle won't go into gear while running, something in the clutch hydraulics may be leaking. Either a leaking clutch master cylinder, or a leaking clutch slave cylinder can cause these issues. Check out the Estimator below for an idea of cost, consider having a shop diagnose it to be sure! https://repairpal.com/estimator/honda/accord