Any tips for a complete newbie

Hi guys and gals,

So I come from a background of mainly FPS shooters like COD and Counter Strike, but have always wondered about LoL in the back of my mind, so today I downloaded and installed it and from watching some videos on it found that I should rank up using bots before going into proper matches.

However, I see so many champions to play and tbh it's quite daunting; I prefer to play quite aggressivly but also want a ranged champion but there are so many I don't even know what to pick as my main.

Hope you guys can help,
Johnny