I’m looking to installing 12 outside LED lights along a path, these will be spiked in the ground, I preferred to use (low voltage) as small children running around.
As
Those lights are not LED.
That company (and many others) has LED Garden-Light "kits" of several sizes.
Here is one group of "kits" which may be of interest
https://www.gardenlightshop.com/70-alder-bundles-kits
When you use 12 V (AC) LED garden lights there is usually no need for a "driver" - just use an ordinary 12 V (AC) transformer, of adequate capacity.
(Although LEDs are DC devices, the "lamps" usually include a Full-Wave (Bridge) rectifier, so that these lamps are run on AC.)
If you are using twelve 3 W LED devices, the total would be 36 W (or 3 A) so only a "modest" transformer is required.
However, it is prudent to specify a larger transformer than the minimum
initially required, since this makes it easier (and cheaper) to add more "luminaires" at a later date, if needed.
If you think that some of these "kits" are expensive as compared to buying a number of lights and the transformer, remember that these include connecting cables with (proprietary) plugs and sockets.
Such plugs and sockets also have a cost!
Because the plugs and sockets used tend to be associated with particular vendors/manufactures, there
may be incompatibility problems if different "brands of lamps are used together.
However, these problems can usually be overcome with a soldering iron and heat-shrink tubing. 
