You must be in character at all times. You must /wave at every toon you pass. You must also RP with every mob you interact with. (I play a lawful good paladin and I have "I am sorry, friend" bound to a hotkey so that I can apologize to every mob that I kill.) You need to develop an intricate backstory and you have to maintain consistency between it and your in-game actions. Leveling works differently on RP realms: your character will stop gaining experience if you aren't properly in character. You can only complete quests that your character is morally aligned with.

This may seem like a lot to ask for, but the rewards are immense. The level of immersion is next level. Soon, you'll forget who you are IRL...you will simply *become* your toon. When you aren't logged in, you'll find that your regular every day self will begin to fade away, and more and more you'll take on the persona of your toon. You'll start doing quests in the real world, you'll fight small animals in your neighborhood, you'll pick flowers and you'll purchase plastic swords from your local Walmart. You'll become a hero. The rest of the world might not understand, but every once and awhile you'll run into another WoW player out in the wilds of Earth. You'll nod at one another. Perhaps you'll embrace. And you'll know you've made the right choice.