How can I add props to a map I'm making?

Yeah so I need to use skybox props (from phx) in a map Im making, which will server as teleports to make it look like you actually go into the house (well duh, everyone does that).
SO yeah…what do I do?
And just in case you’re wondering, my map is going to be a 3d, first person version of this:

(You’re welcome pokemon fans)

Prop_static

Assuming PHX is in addons, you have to move the models and materials folders into the main game. Steamapps\username\garrysmod\garrysmond

If it asks you to merge files, press yes.

Also we have 2 question mega threads.