New to league but not mobas just need some advice.

[cobalt cargo]

I use to play alot of smite an mained adc but I like the characters syndra an irelia an I been playing them both mid im undefeated on sryndra (im gold, just started ranked) but I watch YouTube videos on syndra an they do sooo much damage an one shot some people, I know I don't know what every champion does or what every item does yet ybut I do the same combos an it feels like I barely take them to half hp while I get by like full combo by someone else an just die.....so does anyone have some good sryndra builds or combos, I been hearing you should 1 then 2 after for bug damage but then I also here 2 for the slow then 1 cause its easier then 3 for 2 orb stuns. I know to throw autos been said combos but like I feel I do barely any damage lol #1022243551213535312