Not really sure where to start, need help..

So I finally got the Duster delivered to my house and the engine area is a lot worse than anticipated. A lot of rust. I'm kind of at the point where I'm not really sure where to even start. I tried to spin the fan by hand but it's pretty tight, my guess is because it's rusted, or no oil. I know the car won't start at this current time.

What should I look into doing?

I picked up a gal. of 15w40 Rotella oil, ignition wires, champion spark plugs, STP oil filter, just to do some basic maintenance. Is there any use trying to de rust the engine bay before?

The underside is kind of rough but I don't see any rot/cancer, just rust. Really just overwhelmed since it's the first time I saw the car. Any advice or how tos would be great!