Beginner question: How do people create maps for Unity?

I would like to create a FPS in unity. I don’t know how to code stuff, so I would get most of the resources from free sources, and focus on the map creating which is what I like. I’ve used map editor for games like Doom and Quake, but I don’t understand how people create the maps for the games in Unity. Does Unity have like an inbuilt map editor?

For example: What did they use to create the maps (and by maps i mean terrain + the houses and stuff) in Slender: The Arrival?
Are for example the house made in the built editor in Unity, or did they use a 3rd party program? Are they just imported 3D models?
Could I use something simple like Google Sketchup and make all the stuff on there, then import it within the Unity project?

pls explain this to me

You can create terrain in Unity, as well as a few primitive shapes but nothing complex like houses. Those are made in any number of 3d modeling programs. Yes, you can use Sketchup but I hear the results aren’t very good. Better to use Blender if you are looking for a free modeling program.

Things are not that simple as you think now. We build object within gameworld by many processes. We model them,sculpt them,remodel them,unwrap them,create texture maps,do skeletons,paint weight,animate,then we the put all of these together onto game engine. sometimes,we need somewhat repetitive look of some object in our game world. We use texture atlas there and use tiling. Unity is not a simple mapbuilding application. It is a fully fledged game engine. Get maya or 3dmax if you can afford(you can always use blender which is free) and start learning this discipline.

I don’t think someone on a low budget would be getting maya or 3dmax. No offense, but I think some of the programmers out there do not think about the small fries and push them to the side. I will agree though that having more than one program will help, but work within your budget. Blender as he mentioned sounds like a great option as it is free. It even has tutorials on its site. If you need someone who actually listens and does not shove someone to the side, feel free to ask more for help. Remember the old saying, “If you scratch my back, I will scratch yours.”

Your fellow learner and programmer,
Jakob A. Kattner