This guide is just my first impressions and build of the new champions so I still need to work out a few tricks and completely understand her playstyle.

Attack speed marks to proc her passive more early game give a quicker jungle time and helps in ganks but mainly for an early game advantage also stacks with her bonus 20% attack speed from her passive.

Amour seals standard for jungling.

Ability power glyphs gives abilities that bit of extra damage for the early jungle and also give her a more powerful shield which help you stay in the jungle for longer and farm more.

Ability power quints same reason as glyphs

Standard see to be the best set-up no matter what recently either 9/21/0 or 0/21/9 don't know why. Ask dyrus.

Standard opening boots 3 pots
philo stone and heart of gold extra health regen and mana regen/ health
so far i found it's good to build her quite tanky but with some amazing damage due to he good ap ratios so just build the rest from there sell philo stone and heart of gold as you need to. My items are just what work well for me currently until i find a better build.

Start with w give sustain in jungle take it at lv 1 and 3 then max it second then grab q at lv 2 and max it from lv 5 onwards taking points in you ulti when possible. take e at lv 4 for ganking and stopping them escaping.

Standard jungle could sub ghost for flash if you wanted

This is just a rough guide at the moment until i can get a bit better with Diana but i hope it helps the ones of you that are just starting with her.