The first step, after deciding what race you want to be, is a roll on the following table:
Race 2d6 --------------------------------------- Gargoyle or Centaur 2 Kobold 3 Goblin 4 Dwarf or Gnome 5 Human 6, 7, 8 Halfing 9 Orc 10 Reptile Man 11 Leprechaun or Faun 12
Note that you have about a 45% chance of rolling a human anyway. If you want exact odds, ask me. You must roll in the presence of the Gamemaster.Depending on your roll, there are three possibilities. If you rolled the race you wanted, you've got it and you are done. If you rolled some other race, you may play that race, or you can play a human. If you didn't get the race you wanted, but you really must play it, there's once chance left. You must audition for the GM.
Next, assuming your character design is reasonable, is a live roleplaying audition of your character for the GM. I'll be looking for two main things here, 1) do you really understand the racial attitudes of your character? 2) Is your grasp of the individuals motivations good? Don't be surprised if I take you character sheet away from you and let you role play from memory!
I've found that this process helps me weed out the players who just want to play a race because he or she wants the special advantages that race gets -- I play D&D with too many munchkins playing half-elf fighter/magic users simply because they want to be able to cast spells and able to stand toe-to-toe in a battle.
If you are a good roleplayer and you have a good character idea, you will still get to play your race. If you're a munchkin, you'll probably be playing a human, at least until you learn to roleplay.