Looking for mid and support coach

Hi, I'm a lvl 30 player who kind of wants to start ranked, but I'm not really that good. I main mid and sometimes play support, but id like to get better at it. My main mid laners are mostly mages (lux, annie, and orianna) and I don't really play melee champs. I really like champs with cc and range (as you can tell) But I'm trying to learn some melee assassins as well. If I could get some help before i start ranked, that'd be great. Thanks :)