What fluid should I use, I'm confused
 

Hey guys I own a lancer 2015 with the 1.6 engine and auto transmission 4 speed ( F4A4B ), I looked at the owners manual nothing about the transmission fluid, nothing about filter I'm literally confused with it...
I want to service the transmission, I already bought a filter MD758684, but it came with no gaskets or anything so if I open the tranny how do I seal it back or it's simply sealed back with RTV?, I'm also not sure what fluid it takes I haven't order yet, what fluid should I use? how much fluid should I order?
Can someone please help and tell me exactly how to service the transmission?

If I drive at slow speeds sometimes it smashes into gear, only me the driver who notices it other people in the car say they don't feel it is it something to be worried about? - I owned the car since new it was serviced at the dealer and they did do a transmission service i'm not sure if they even changed the filter tbh...