if i main a champ for every role and have 2 back ups. will i win more in ranked?
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It certainly wouldn't hurt. Being flexible in champion select is always a fantastic start to any game, ranked or not. Even if it does not initially help you at your current rank it will assist once you begin to climb.
i just tried to be flexible in a game and a 3rd pick went top vel koz he didnt get mid like he wanted.
so even though i practise all this time, someone can just troll and we lose?
Sadly that is something that happens. On the bright side every single league player has to deal with trolls, which shows that it is possible to lose matches to trolls while still successfully climbing up to diamond.