I would love to get some advice for my recent champion: Rengar, The Pridestalker

Simply the title. Any advice would be awesome really. I got to try him in One-for-All and I WAS HOOKED! Now that I have him, I thought it would be a good idea to reach out and ask for some advice on item builds (and preferably: a good order to obtain them in), Rune advice, and skill order advice.

Thanks in advance to anyone that helps me out!