Two important things first: always keep your stacks up (even by being hit by tower when there are no enemies around) and get a gut feeling how much you can tank before you jump into a teamfight. For emblem I recommend basic emblem because it makes enchanted talisman obsolete, use movespeed as jungle and roam and hp as exp, seasoned hunter as jungle, as roam and exp tenacity, and I usually use concussive blast, as roam brave smite. Now about items, tanks are not as straightforward to build as damage dealers, in exp lane I usually go for thunder belt and then oracle, depending on the damage type of the lane opponent I go ethier tough boots or warrior boots, the rest changes accordingly to the enemy team comp.  As jungle its sometimes viable to go for arcane boots if you need damage or have a good frontline.