I wanna make a Tomodatchi Inspired Game

Hello! I am *extremely* new to game development and as the title says, I want to make a Tomodatchi Life inspired game. The problem is- I have no idea where to start. I want to make a bunch of small games to learn the basic mechanics I want (customization, caretaking, etc.), however I also don't know how I'd implement the elements like relationships and that kinda stuff. Basically- Help. How do i game dev