It should all be visible in game in the race description with max stats and modifiers as well. If you create characters of these races you should be able to see the appearance options available.
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 :).