Welcome, and good luck!
For fixing up the interior, my guess is that a self-service junkyard is your best friend. Also called a pick-and-pull.
Currently getting +/- 50 mpg in fall weather. EPA is 31/39 so not too shabby. WAI, fuel cutoff switch, full belly pan, smooth wheel covers.
Now driving '97 Civic HX; tires ~ 50 psi. '89 Volvo 240 = semi-retired.