Steps for making a world map

Hi guys, I'm about to try making a world map for a 2d top-down game (Zelda, pokemon, final fantasy style) and I'm not sure how to go about designing one.

Would I be able to draw one giant map and mark immovable objects such as trees, rocks, buildings, mountains etc. as colliders? Or do they need to be added afterwards as their own sprites?

 

You're better off adding the trees and houses, etc. as separate sprites so that your main character can be concealed by them (like in Zelda, when you walk behind the trees).

They're also more reusable that way / you can customise the collider per object (round ones for trees, rectangles for buildings, for instance) and then store them as ready made prefabs to be dropped into your scene!

Good luck!