great info.
as a 7 year player i can tell you one some things too.
- play whole day everyday
- play one character (or up to 3) - you wont be esport player with 3 character champion pool BUT you will carry every game from bronze to diamond.
people make dumb mistakes they try 30 champs at once because pro players tell them to learn all roles, in the end they dont learn any role .
even as a 7 year player that with op character has 20 games win streaks on diamond im still SOMETIMES losing on bronze on new acocunts
so dont worry. pick CARRYING character. my mains were shaco,tryndamere,sion,ryze,jayce (they all got fixed)
riot when creates a new champion it will ALWAYS be OP so you can buy it and train like crazy. they wont nerf it in 3 months at least so you can fix your rankings with him.
also no skype. Music, chocolate (sugar) and energy drinks/coffe works GREAT. lets you focus.