EVGATech_AndrewAWelcome to the Forums! Yes you are correct. You can use one of the 4-Pin connectors and have the other 4-Pin connector un-used.
Cool GTXYes, if your MB only has a connection for one, 4-pin EPS, then you can use either of the split 8-pin to power your CPU. Don't worry about being a "rookie" - ask away with your questions. We all started new to this at one time and the form member here like helping others.