as you can see mobafire really ruined this, its actually alot depending on rageblade
as you play youll have like 400ap and 340 ad
also high spellvamp and steal, useful ganks and be really fed

okay so i start with book,pot and alpha strike
why?
alpha strike makes it very easy to quickly kill bosses like blue buff after pull
and also at lvl 3 you get heavy heals
why taking heal at lvl3?
because its difficult to jungle without that bonus ad with passive
so you just have to farm wraiths and maybe roam around a little
at lvl 3 you heal up and take on red buff, then go gank and recall

after that you buy pick and boots,and maybe some pots if you need to
hold onto pick as long as possible because after 5 minutes it gives you extra gold and some ap
then go into rageblade as fast as possible,because it gives you attack speed and more ap,
think of fighting drake and getting low, you got 8 stacks and youd heal almost twice the amount you would without stacks.

after that get some steal with gunblade,thats the peak in jungle, after that you could solo anything,and gank without worrying,but that is only if you get fed, its a good chasing item,
you ulti chase a guy and use gunblade to slow him, and secure the kill

next item is hourglass, since there should be teamfights going on,you should make use with q+w, with increased def, if you get focused just click on that hourglass and heal.

next item is called bloodthirster, which makes kills and chases really fearful
also you get crazy sustain with red buff or ulti, also about thirster its completely thing of a taste, you can take infinity edge too after

and the final item; triforce
as the most expensive item in game,always go for it last
it gives you ctirical,speed,ap and hp and makes your basic attack after q twice as powerful
just think of how many steal you can get if you use e or r in delay of 1 sec

as for early ganks,you have to use q to pull,its very recommended to have red buff, cause yi ganks work almost like shyvana's just that he pulls faster

always build ap for ganks, cause 110 ad and 300 dmg q is always useful
and then heals make it able to continue ganking

as for teamfights,use that pull to take enemy carry out 1stand then if you get focused use hourglass or heal,your next target is the ap carry,after that just wipe out the rest of the team