You can essential work any project on circular, even a scarf. I would get say a size 8, 9, 10 or 11 needle and make a scarf. I personally don't like them, the "needle" part is to short for my hands and causes them to cramp, but I have a coworker who swares by them, she makes all her hats on circular needles. For the DPN's they make kits for making socks, that might be a good place for you to start....
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