The typical DC power shows milliamps, does it help when powering more than one building or set of lights to get one with say a 1 amp capacity? Thanks in advance.
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You need to measure how much current (amps) is being used by all the lamps, and add them together. Then that will tell you how big the power supply must be.
Do you have a digital amp/ohm/volt meter?
Make sure whatever wallwart you get offers regulated power. If you use one of the unregulated ones and don't load it near it's rated current, the voltage will be higher than you expect, perhaps with unpleasant consequences. 
Thanks for the replies, the one I was looking at Radio Shack had several settings. Would that be what you mean by regulated? Thanks
No, that feature is called "different voltage settings."
Regulated means that regardless of the load, the output voltage remains relatively constant.
I am running a couple of 12vDC wall warts with 12v LEDs. Because they are in regulated I run them through a step down converter to make sure aim at 12 v and not over.
