If you have a crank, no start then you need to start with basics like fuel pressure and spark.
You can rent a fuel pressure tester and spark tester at most auto parts stores.
If you don't normally work on your car then use this link to find a good shop near you that can diagnose the issues.
https://repairpal.com/repair-shops
Alex
RepairPal Certified shops can diagnose and repair your 2004 Mitsubishi Eclipse. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.