I can't give you an exact guide but I can give you a guess to each answer.
Is it really that hard to make a simple guidebook?
Can you said KYS once in 50 games?
not if it is caught, instant 2 week ban on that one
How about it's variations like KYYYS?'
Same as the first one, if caught instant 2 week ban
How about EZ, is that better?
Yes it is, it won't give you a ban if you use it as only toxic thing a game. Use it a lot and you might be banned.
First timing a champion?
Not unless you are inting on it. Especially in normals this is even encouraged.
Thretening to report people who first time a champion?
threathening to report builds up to a ban.
Dealing with trolls?
report them, talk to them and you are literally playing into the troll. They wan't to ruin your game, don't let them, just practice your farm.
Can you spamping people?
yes, you will be muted though.
Yeah sure, the comunity is toxic, but a lot of people don't even know what counts as toxic.
toxicity is everything a person says with no other goal then to insult other players, if you don't do this you are not toxic.
examples of toxicity that is considered not that bad and won't get you banned if you use one of these for one time and even if they do it is only a chat restrict if you haven't been banned before:
Stop feeding vayne(this doesn't help and is just trolling)
Fuck you
ez
get fucked
noob.
Examples of toxicity that are at least a 2 week ban if caught
the n word
the f*g word
kys
basically racial slurs and any politcal insult.
examples of what some people see as toxic but actually isn't
Help me
Try to not 1v1 anymore vayne
We need to focus on the mid laner