EDIT: Sorry guys the scripting is backwards or something for the items, just switch the starter with essential and you'll be golden in reading this guide.

So I'm not the best in the world, but that being said, I did rather well using these items with this playstyle. My focus was to boost attack to make the most of his health return from passive. 
So why jungle as Aquaman? His spear throw and E abilities mixed with his knockdown are great for ambushes, especially when you have a runner and you use his ult to close in. I will note that I secured very early kills using this build. 

As stated this is a guide for playing him as a hybrid, so that way you can make the most of all his abilities, and pssively speaking his health, power, and physical are equal across the board.

Now as always buy items based off enemy, but I always suggest to buy refundable items and I suggest Deathstroke's claymore as your first major purchase, you just can't beat that extra 5% of opponents health as extra attack damage on basic attacks, plus it's activate ability, and the amount of damage you'll do to jungle creatures now.
You might ask why I don't start out with a health booster, I find that if I can't do enough burst damage to kill an enemy in beginning game, that I won't end game, so I need that extra gold boost to be able to support end game tanking.

Not much to say about his attacks, just make sure that when jungling, press E, do a basic, then E again, and so on and so forth to heal to your best potential.
For his ult, you'll have to figure that out as well.

Higher deathrate than I wanted, but I'm still trying to figure out how to be in the right place at the right time.


Anyway, this guide was assuming you knew how to jungle and have a little experience prior to playing him, so give it a shot, and if you like it, please rank my guide up. Comments are always welcome, criticism helps improve just please be tender. And if you decide you like parts of it but want to change it, then please give credit where credit is due.
Thanks for your time!