Controlling The Camera

greetings folks,
new to the forums here and 3D design - though I am familiar with blender.
i am trying to figure out two things…
1.) How do I get the camera to focus directly onto a plane? Suppose, for instance, i laid out like a map on the X & X Axes, and i wanted the camera to look straight down from up high on the Y Axis… everytime I go to position the Camera up on top of the Y Axis it’s tilted, and I cant get it to starighten out. Any advice here?
2.) I cant remember how to do this, so please refresh my memory here - how can I do numeric positioning of objects? In Lightwave I think you just press the N key and a menu pops up - is there something similar to that in Blender?
thanks
quint