I’m only going to give you give advice for midlane:
Play Syndra. She’s relatively easy to play, has good sustained damage with Q, is a lane bully that scales into the late game. She has insane burst, and great long range CC. She doesnt hard lose any lane matchups, but she can completely shutdown assassins like Zed and Talon once she gets the ball rolling. She has oretty good waveclear too.
Take either ghost/flash or exhaust/flash. Ghost because it covers up her main weakness, no mobility. But ghost also makes her very strong, since she does not stop moving while casting Q W R. She only stops when she uses E.
Take Comet or Electrocute. Lvl 1 you can already poke with ease. Level 2 you can combo with q e with ease. Level 6 you should have a kill if youve poked down your laner enough. Level 9 is your biggest powerspike in terms of instant damage.