Junglekaiser: 21/0/9
Marks: flat ad
Seals: flat armor
Glyphs: ap/lvl
Quints: flat ap/move speed
You can use different summoner spells, I prefer flash/smite most of the time.
Regrowth pendant and 1 health pot.
Starting at small golems, lvl up Q first. Use q on the first golem. Kill it with smite. After small golems move on to wraiths - use your potion now - Lvl up w, use w when your q connects on blue wraith.
After wraiths go to wolfs, wait for w cd if it's down. Kill wolfs, lvl q if move speed quints, e if ap quints.
You should defeat blue golem around 3:00-3:15 depending on quints choice.
b, buy boots and 1-2 health pots.
Go to small golems - lizard - wraiths - small wolfs. Now you should be lvl 5 at around/under 5 minutes. If there is an opportunity to gank, use it. But you should primarily try to lvl as fast as possible because that's his strength. You can easily steal camps from the other jungler, just be aware of his teammates.
Skill priority order: R-Q-E-W
Q will deal massive dmg when ganking if you can land it on a single person, and when you are invading it will help you win duels, just don't get caught.
The build I usually go is: rush gunblade, starting with hextech revolver, sell regrowth pendant if you can afford it on your b. You can get boots after hextech revolver or if you are doing good wait till after gunblade, I got gunblade at 11:30 one game hehe.
boots-hextech revolver-upgrade boots I usually go swiftness or cdr/gunblade- rylai's - lich bane - death cap - void staff/zhonya's/FoN
It depends what you need, some games I need to bd, which he is very strong as when you have alot of ap and lich bane. Sometimes you need a bit more tanky because of focus.
Rushing gunblade is important because you don't have ignite and when you use it in conjunction with your ult you can get ghosts so much easier.
That's all I can think of right now, ofc playstyle is the most important. Your goal is to kill the carry and make a ghost out of him, a bit like poppy, except you get an insanely strong minion if you succeed in killing their ad carry, I had a tristana ghost that did 450 dmg per shot, I don't know if it was a bug but it just cleansed their whole team so fast . This is where I find flash more useful than ghost.
If you have any questions I wouldn't mind answering them.