How to Create a 2D Map Like Silent Hill maps?

Hi.

I'm working on a project which a girl is having a lantern wandering in a maze. there are some items and interactable objects and enemies. i want my map to behave something like a silent hill game: when you pick an item or see a closed door or finding a button or even enemy, it shows in minimap.

if you dont know what i think here is an image for hint:



first its a plain map and then when you wander in the environment it updates.

the problem is i am beginner and i dont even now where to start ... should i consult a 2d artist? using render texture or ... ?

 

Here you go