Troll or Undead?

[iwalkinfire]

Making a mage which race should I be?

[Pennydread]

blood elf

[fordragon77]

It doesn't matter. Choose what you like.

However if you don't care and/or want some objective reasoning:

For PvP Undead

PvE troll

But at the end of the day you are much better off playing the race you like. Vanilla is a huge time investment into one character.