Originally Posted by
NatureDrake
The OP didn't ask if it was worth coming back to WoW for live though, I think. The OP was asking for our opinion on what kind of character to play during Legion, not before.
On topic:
As other people have said, it's really up to the individual. Play whatever race you enjoy the look of most. Perhaps it'd be a good idea to play the race you were back in Wrath. We all have those races that are sentimental to us. As for class, once again - what did you play back in Wrath? Melee, or ranged? Did you enjoy whatever you played? Or do you just want a change?
My last suggestion is to play a class that has more than one DPS spec. I'm assuming that's what you want to play, because only the DPS role has the choice between being ranged or melee. Generally, all healers are ranged, and all tanks are melee. So! If you want to play something as DPS, it might be smart to play a class that you could try the other specs of if your first spec choice doesn't fit your preferred playstyle. For example, if you roll a DPS priest but don't like Shadow, you're out of luck! But if you roll a Mage, you can switch between three completely different playstyles whenever you want to. (Granted, one is usually superior in terms of damage output, but even so. Choice is nice.)
Following the mage idea, they're awesome fun and have lots of useful abilities out of combat. Slow fall for exploring, teleports, conjuring food, etc. Plus, you can also try out having a permanent pet as Frost. If you like DoTs, go Fire. <Insert overused joke of Arcane having only one button to press>, go Arcane.
Good luck!