Dingleman

I've put some custom objects in a map that work when running it in the gamemode or pressing F5 in the Map Editor to test it out, but I can't get it to show while the map editor is in "editing mode". I'm new to the concept of .lua's so I would really appreciate if someone explained to me what to do here, if it's even possible

I'm making a .lua in order to position custom objects within my map. I have already identified them in the meta, but after scanning through some different map .luas that have custom objects for reference I noticed how they all have a "model=(model)" field at the end of each positioning lines. How do I determine the ID of my new custom objects in order to put them here?