So im looking to start WoW, i played it ALONG time ago but never really played it.

I was wondering if its worth me leveling a character as the new expansion is around the corner. I started a DK today and am not sure really what i should be doing

Sure is 100% worth leveling. With he revamp in classes it is better for you to start a fresh class to learn the class. Find something you feel comfy doing. I started a hunter in wotlk and have always had a hunter at max level every expansion. Message me if u might need help or anything. Ill level a char with you if you need some help as well. End game is great getting there is 100x easier then before as well. I recommend leveling a char though

ya level a char it'll teach you basic mechanics the game has changed vastly from a long time ago, boosting a char would do you no service if you have 0 grasp of your class at max level