am lvl 52 have completed main quest and dawngard been playing for a couple of hours and nobody has come up to offer me the quest any suggestions?

Try this

http://www.gamesas.com/topic/1427554-how-to-start-the-dragonborn-dlc/

4 threads down on the same page...no less.

"To http://www.gamesas.com/topic/1427523-few-images-i-took-while-you-wait/# Dragonborn, you must travel to Solstheim. This can be done at any point after installing the game add-on content by travelling to the Windhelm docks and locating Gjalund Salt-Sage, a sea captain that will take you to the island for a small fee. The “main” questline of Dragonborn will start soon after you have started the main game’s quest “The Horn of Jurgen Windcaller”, after consulting with the Greybeards for the first time. After having started this quest, you will soon run into a group of Cultists when traveling around the world that will discuss Dragonborn’s questline."