New to using blender, and have an image as a plane in the centre point. I'm trying to set a camera up to face perpendicular to it which i preume is doable by resetting position to centre, which I've done, and then changing the angle, but I can't find any shortcut to press to face it downwards, and can't find any input boxes to manually set the rotation by value. Any help?
Select the camera.
then go to Top View (7 on the number pad)
press Control Alt and 0 (on the number pad) (that moves the camera into the position you're viewing from in the viewport)
In the N menu change the X and Y location of the camera to 0 to center it exactly
You can move the camera up or down as needed (G Z and mouse drag).
All that is not exactly just one shortcut, but it's exact. You can input a value for rotation by typing R then Z (or whatever axis you need) then a number such as 90. Then end off by typing enter or doing a left mouse click.