You can use any cable designed for v-brakes. There are, of course, more expensive cable options (Avid Straight, Flak and Full Metal Jacket), any good quality brake cable/housing will work.
You must pay particular attwntion to routing the cable to the calipers. They need to be routed as straight as is possible to get good performance.
Do you have a cable cutter? Have you cut and installed cables before?
If not, it might be a good idea to find someone (LBS or individual) who has some experience with not just cables, but disc brakes. Let them install them for you. You can do it yourself but, you have stated that you are a newbie. Perhaps disc brake/cable installation isn't the place to start learning to wrench on a bike...
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