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I dont believe there is anything different heavy RPers to casual(light) / Medium RPing aside from how committed you are to RPing. I like to define Heavy RP as that RPing is your main focus in the game. You join an RPing FC(or not, doesnt have to be), get super involved and immersed with your character and his/her story. Basically RPing is all you do on this game. If you do other things in the game, such as crafting, raiding and so on, you would fall into the Med/casual RPing. But this is just my opinion, since there is no real rule that determines whether a person is a heavy RPer or not.
But just like Tyll'a posted, I'm also willing to help with any questions you might have.
But just like Tyll'a posted, I'm also willing to help with any questions you might have.