Hey @Krillblr
Hope you’re having a wonderful Monday!
So I’ve got a few sources for you to look through that might help you atleast get started!
- Unreal Engine Learning Course all about 2d.
- “Live” training video hosted by Unreal Devs. It isn’t an rpg style game but the skills should translate!
- Unreal Documentation, with a ton of information about all things 2d.
Hope these help! 
Goodluck.