Hey Scotty, i am new to car. My question is: Do we need a special fluids or normal water to refill the radiator (Engine)?

you need 50 percent coolant and 50 percent water. Many stores sell it premixed that way in a jug

I have noticed that my driveshaft at passenger side is leaking oil, i mean i saw oil all over the boot. what should i do? just leave it like that ?