If your just flying a small ordinary drone that you can buy at bestbuy.. you dont even need a license (with certain rules being followed).. just fyi.
the UAS cert is for commercial ops ($$$) OR just an extra cert to have in your pocket.
If you're already a Part 61 pilot there is a shortcut for certification. Goto FAASafety.gov and take the course ALC-451. Takes about an hour and a half and there's a 35-question quiz at the end.
Our school offers a UAS course if your getting the cert or want some training.
Besides that if you already hold a cert go to the FAAST site and take the 30 min drone course. Then fill out a 8713 and have a CFI friend sign it for a beer.