I’m using Modular Sci-Fi hallways and interiors. When I drag meshes into the level, I can’t see if they line up because the scene is too dark (or the meshes themselves).
I’m a noob at this type of stuff. I’m using UE 4.10.2. I’m probably not choosing the correct settings before clicking “Create Project”.
Create a new project with the starter content, then open a map with the envi in the ‘Starter Content Maps’ folder(try). Seems like you have open a map with no envi then the reflection is black since there isnt any envi. Or put a light just in front of your mesh ? 
You can also try to hit Alt+3 or Alt+4, which turns the viewport to Unlit mode then just place a directional light into your level and you should be fine for the moment.
Thanks for the tips. I’ll try them both.
Both tips worked. Thanks again.
I’ll be looking at more tutorials as my build progresses.
You doubted us? 
Nope. I wasn’t sure what I was doing wrong.
I’m going to try the lit/unlit method and using a spot light. I’m trying to build the insides of a spacecraft with very little windows so do I need “light source” and “sky sphere”?
If you’re using the “unlit” method, there’s no need for you to use a light at all. Basically what it does, is to remove all lightning information, and show everything “unlit”. You would only need a point light, sky light, directional light, or something similar, if you wish to add a work light, and remove again once done.