Adding/removing icons to the map

[CrittenxD]

DISCLAIMER: I am a beginner when it comes to any form of coding, I am also using the classic api in preparation for the upcoming release. I've been doing this for around 3-4 weeks. Be gentle please!

Hey, I am in the process of creating my own questing addon which displays what to do next on the screen (similar to vanillaguide). I've made pretty good progress so far, but I am stuck on the next feature I want to implement, which is adding/removing icons to the map. I am struggling to find any information on how to do this, my google searches end mostly in how to make a minimap button guides or finished map marker addons.

I simply want to create a function which adds an icon to coordinates x/y or removes an icon.

P. S.: I am also wondering about the different zoom stages for the map, I feel like I would have to handle each of those for seeing the icons on all stages.