Change every fluid you have. Water is by far less viscous than oil and it will find its way into the casings.
Pull apart all the electrical connections, spray them with contact cleaner and use some beryllium grease/electrical paste for the main connectors so prevent further corrosion.
If the car was running when it went into the water, Id' be looking alot of new items. Every single fuse you also know should be replaced, the under dash ones are more likely to pop than the engine bay relays/fuses (i'm assuming the water didn't get there)
To be honest, take the car home, strip it, drop the motor, pull it down, and put it together with new seals/gaskets, get another complete loom from someone on here and put it into the car.
You might get yours running but it won't be the same, something will come up, sooner or later.
As others have said, I would scrap it for what you can, do it tough and fix the other cars up as quick as you can.