Help with camera acting sporadic!

Hello,

I'm pretty new to After Effects, so this may be an easy fix.  I first started out with a white solid as a floor and then a 3d wall.  I've got the camera first stare out into nothing to show another wall fly, then have it wrap around the wall to show the floor and other existing wall, and then going onward to the other side of the wall to show it explode.  Here are the screen shots(the end of the animation is at the top, so go from the bottom up):

http://imgur.com/a/NB3nc

Basically, here's my problem:  I've only messed with the Y rotation of the camera to get it showing the floor and pre-existing wall for most of the shot.  Though, the camera is spinning around in all different directions and I'm not sure how to fix it.  Also, at the beginning, makes the floor and wall all stretched and such.  Any help with this would be fantastic!

Thanks!