It is variously called carding cloth or card clothing, and includes both the backing material and the steel pins.
Here is an online source:
If you look at the prices, though, they are not much less than buying ready-made hand cards. I live in the U.S. and I got my nice set of small hand cards on eBay from a woman in Scotland! The total price was less than buying the cloth alone.
I would encourage you to make your own spindle. It's easy and the handmade ones work well enough to let you know whether or not you enjoy spinning.
About fiber: buying a raw fleece and going through the process of cleaning and carding it is an investment in time and money that you may not want to make at this stage. And you end up with an enormous bagful of one type of fiber, which will take ages to spin on a spindle. May I suggest that you buy just a few ounces of several types of prepared (already combed or carded) fiber, either dyed or natural, and try those to see what suits you best? I don't know any sources in Ireland, but one good U.S. source is paradisefibers.com I don't know whether they ship internationally, or what the shipping costs might be, but they sell many varieties of wool, silk and other fibers for just a few dollars an ounce.