Green Lanterns Aren't An Earth Group

Or in other words; until we declare otherwise, only one Lantern Ring may be possessed by a Terran. Assume that the same is in effect with the other six Corps (though IMO it's kind of early for them), and Black and White Lanterns haven't come into play yet.

Now for the other question; does that mean you have to be Hal? Hell no! If you want the first Earth Lantern to be Simon, John, Guy or Kyle, feel free... Well feel free to be Kyle without killing of the entire Corps. Right of the bat assume that that's a no-no.