how to get good

I recommend just play more and watch tips on how to do different kinds of plays

nice LEAGUE OF LEGENDS people why don't i find nice people ingame

Probably best to learn against bots at the start.

Watch videos on youtube from the published coaching sessions. Lol is a solved game now, pick your preferred champ and role and just watch a bunch of videos. You'll jump from being bronze to gold pretty fast.

The first rule to be better at League of Legends is do not play Yasuo and this is the last rule.