Walking Simulator?

Hi, I’m super new to Unreal Engine 4, I only launched it once… Shot some cubes… Tried to delete the cubes; gave-up then I exited the program…

This is not the point though; I’m fairly experienced in Blender. And I love to make architectural (Interior and exterior) designs!
I saw someone importing Blender created models to Unreal Engine 4l So I know I can do it.

Now is really the point of this thread; I hate navigation in Blender, and If I’m not in rendered view the texture look horrible, I’d like to be able to navigate my designs in a natural way (A.K.A: walking), so these are my questions:

  1. Can I make a walking sim with no interactions what-so-ever? (If I can make the doors open with a button or something please tell me)
  2. Can I make an empty project and fill it with design every now and then? E.G: I made a house and import it to blender, then save, made a market and import it, and expand the city slowly?
  3. Are Blender model files even import-able?

Thank you all for your time.
Best regards.