Basic Questions About the Level Editor

[Yonmaja]

I've been fiddling around with the level editor for a couple hours and I'm able to make a room and such, but there are some things I haven't been able to figure out how to do.
1. How do I move the camera in the perspective window? All I can do is rotate, and if something is far away it's hard to line up properly.
2. Is there a way to combine a set of smaller items into one large one? What I mean is that, could I take a bunch of wall segments and combine them into one large wall, so I could rotate it instead of one segment at a time?

Pleasee be gentle, I'm not a modder.