I have to agree with those who say, who in their right mind, plucked what looks like a rock out of the waters' edge, cracked it open, to find a slimy looking center, and thought, I should try eating that? I wouldn't have been the first person to try that. But oh can they be good.
I like oysters raw - served very simply with a little lemon or vinegar, maybe a dash of hot sauce. How can I describe this, despite the looks, they are not slimy, more slippery. Bite into them, and there is a texture. I find the Pacific coast one's more flavorful, more salty, than Atlantic or gulf coast. I am cautious of raw oysters from warm areas, colder water generally is safer. In New Orleans, order them fried.
I like them battered and fried. I can't tell you how to do that, as I have always left that the pros. I have never opened an oyster, always left that the pros.
I have to put oysters on the list of things that look weird, but taste wonderful. Don't let looks scare you away.