Good day mga Tsikoteers!

I'm a newbie in terms of A/T cars. I recently bought a 2nd hand Mitsubishi Space Wagon for my wife. Here's my questions:

1. how many kilometers must it run before changing the ATF?

2. how many liters of ATF must I instill?

3. what kind of ATF must I use?

The owner's manual is not with the car when we got it. And I'm a kind of DYI driver so please bear with me.

T I A !