just about any commercially made nutrients designed for hydroponics should work fine. Just get nutrients designed for the type of plants you plan to grow. Vegetative nutrients for non flowering plants, Bloom nutrients for flowering/fruiting plants. And/or a combined (Vegetative/Bloom) nutrients for continuously fruiting plants like peppers, tomato's, strawberries, etc..
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can I use paper towels on the bottom of the pipe in place of capillary matting
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Well first I have never seen anyone using any type of matting in a NFT system, any type of mat would block the water flow. Second, I wouldn't put any type of paper in it because it will just dissolve and eventually just clog the
pump and water lines. Not to mention turn the water cloudy with all kinds of particles floating in it.