I host our club every second week. Best tip I can give you is, don't try to be the Star, if the MC is too noticeable he's probably getting it wrong. It's more about what you do off stage too, meeting and greeting, massaging egos, encouraging everyone, tell them all how much you enjoyed their set, and don't let the intro's drag out too long, but do say a little about who's up next. Don't try funny lines and jokes unless they're tried, tested and quick. Oh and try to enjoy it ;)