Welcome! As an MMO player, what about MUDs appeals to you enough to try them in the first place? The answer to (1) probably lies there. As for (2), the smartest thing you can do on any mud is just sit and watch for a while, get a feel for the game, get a feel for its "chemistry" then decide if it's right for you.
As for story, some MUDs have stricter themes than others, but once you're a regular you ARE the story...
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