For bot support :
i wont recoment Nami/Thresh/bard unless you already tried them and like their gameplay they are hard picks .
For adc :
or
picks like Quinn/kalista/draven same as before(you need to see some stream or youtube videos to llearn them they need speed and skills) .
For top :Pretty much noone they ar ebetter top laners with less ip maybe gnar.
Its better to start with somethin easy and not go immediately onhigh skill picks.
For example take leona and then once you learn how to play her go for thresh.
Start with janna /morgana and then go for nami (less mobility /harder spells).
Start with jinx and if you see you want something more "extreme" go for draven.