help me with my runes/builds
So I'm an P.O.S. unranked scrublord trying to work on my runes and builds for certain champions, right now I want to go full lethality reds and quints for a jhin build where I go for all three lethality items, boots, phantom dancer, and bloodthirster (maybe an infinity edge somewhere in there) but I'm using the same rune page for many of my champions, this includes illaoi, rengar, and rek'sai, from what I understand about lethality it's not a big help in early game and I think this hurts me when I'm jungling, I'm worried I might not be doing enough damage to my early clears, and on rengar I usually only get youmuu's as a lethality item anyway, as far as rek'sai and illaoi go? no idea really... should I go back to full AD reds and quints on my runes or can anyone help me decide what else I could do involving lethality, should I wait til I can afford a new rune page to set aside?
(Order varying after Edge of Knight).