If you have SC drivers license, you just need to go into DMV, because they don't issue first time gold star real ID online through the mail. I took birth certificate and proof of residency (power bill) along with my current drivers license, but I didn't need them, because my license was current and not out of date.
http://www.scdmvonline.com/Driver-Services/Drivers-License/REAL-ID
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