I'm a new player and almost exclusively play ARAM. I dont really know any of the champions but I do like just playing random ones and trying them all out. However it's kind of annoying to have to Google what runes I should be using for which champions.
I think it would make the game much more accessible for new players such as myself if there was something on the champ selection screen that says, for this champion, you should use "Resolve" for example.
I really like how the shop in-game recommends which items to buy and it helps a lot for someone like me who doesn't play a lot nor wants to play it super seriously.