DTR2
I'd be inclined to just let nature takes its course and let the newts find your pond.
I completed the building of my wildlife ponds in early 2005 and hadn't previously seen a newt in our garden during the 30 years of living here. However, last summer a smooth newt turned up out of the blue, along with all sorts of other creatures including pond skimmers, water boatmen, 2 grass snakes and even a Kingfisher!
So, for what it's worth, my theory is that if the pond is a suitable habitat the creatures will find it
Jeff