If you are jibber, then yes, detunes are usually in order. Even then, the vast majority of jib boards come factory detuned nowadays.
But none of that matters seeing that you are new.
Just mount your bindings and ride as is. I think people worry way too much about factory wax. I have always ridden factory wax the first day. On Burton boards, I actually ride a couple days on it. Some companies obviously have a better waxing process than others so just give your base a look over after your first day. You will be able to see dry spots if the wax wore out.
Learning to wax your own board is the best method. There are tons of videos out there that show you how. I do admit, I have taken my boards to the shop here and there on lazy days. I always watch them do it though.