If you are trying to license without any paperwork, or previous license plate, you will need to call the state DMV in Pierre to do a search for the vin nationwide. It will take a few days (four or five in my case).
I am a Belle native and still license my vehicles there. I bought a '55 FC last year, also without paperwork, and the ladies at the courthouse could not do much for me. They have taken care of everything else for me over the phone for 20 years, but building a new title they couldn't do. If it was previously registered in SD, the state office will be able to track it down, and you may have to untangle it with the previous owner.
PM me or email if you need anything else, but fear not, others have covered this path in your neck of the woods before.