As RickRollerIV said,
"Don't go into rank until you have a lot more games under your belt".
I completely agree with him as too not going into Ranked matches without doing a nice amount of "Draft Matches" and getting down a few Champions. It's good to learn all of the roles and learn to play at least 3 different Champions in those roles as to the "Banning Phase" in Ranked matches.
As a new player, When you hit level 30 you'll need to do quite a few matches to get enough IP for your runes before you go into Ranked Matches if you don't have enough already. That way you'll also get the experience you'll need to learn the Champions and Roles you'll be playing.
And as I always tell new players, Please don't be a butthole and Troll, Flame, Instalock or AFK. People like that ruin the experience for other players and you have a higher chance of getting Banned or Suspended. Plus it's just an overall annoying thing to do.
Twitch Tv is a great place to watch Professional League of Legends players play live, You'll learn a lot from them and most of them commentate on what they're doing and how to deal with situations.
Probuilds is also a good site to search for a champion and see what some professional players build on them, Along with Runes and Masteries they have for them.