Clean and rub all rusting parts with WD-40 before fixing it.
Take carpet and seats out for detail cleaning and find any hidden damage parts. As she is old car since 92 so do check if water is going inside the car from anywhere. from dashboard, pillars, doors, mudguard area. with a bit pressure water.
Looks like gari showered hai.
check engine, brake and gear oil condition, radiator and its cap condition, spark plugs, suspension, brake pads, shocks etc. Tyres and rims, cylincer etc.
Check vipers and water bottle. all lights are working properly. Horns etc If AC is installed check that as well but its optional now because summer is over. check air and heat blower.
Onces, you feel ok with this stuff. then start working on detailing to make your car lush pash.
Good Luck