I have a level 58 shaman that i do not play anymore, dualspec and all! But i only play my DK, so wondering if i could sell my shaman, or will that delete my chances to play my DK?
So can i trade my shaman which is my only 55+ and keep my 58 DK and keep on playing it.
No, you wouldn't have it disabled, just like deleting all your level 55 and up characters wouldn't keep you from playing a Death Knight you already had created. You might just be unable to create new ones, I don't know if an existing Death Knight fulfills the requirement to create new ones or not, but they probably do.