As a new player i didn't know about it, lul, i just used the quick start option, i didn't know the game was actually good and had this character creation UI.
That being said, the diference between drows and dark elfs is that of skin color.
And i think that the only real diference(physically speaking) between a normal elf and dark elf is that dark elfs use ponytails independent of its hair size, basically the game led me to believe that dark elfs is just a minor tribe that was separated from the elfs some time ago and the only diference is a cultural one. Its ok i guess.
Thanks for the help :).