Getting the Labels aligned on page can be done with Grid/Guide with Snap On but you want the Text to align on the Label. I'm assuming that not all the Text will be the same length.

To get the Text centered on the Label you can link the Text with the Label and do an Align . To do this, Click one Label (in Layers palette) then click the Link icon to left of the Text (in Layers palette)  that goes with the Label then use the Align options with Move Tool selected. If doing it this way turn the Snap off.