Hi there my name is Robert and this is my trynd guide.
Browsing around MobaFire I looked at the guides for Tryndamere and couldn't really find any I liked at all.So I would just like to share a build that I think works REALLY well with Tryndmere.
Guide made by Robert95SK(US) RageMan95(EU)

Make sure to read the guide, or this build won't be effective!

There are those who choose not to live in one of the great city-states of Valoran. Instead, they live in remote locales, often as part of a nomad or barbarian tribe. While perils abound in these untamed lands, there is also great freedom in being removed from the politics of Valoran. Tryndamere was born a member of one of these barbarian tribes in northern Valoran. Even as a young boy, it was obvious that he would grow in martial prowess to become one of his clan's greatest warriors. However, as his clan moved south between the Howling Marsh and the Ironspike Mountains, they came across strangers in black garb, brandishing symbols of a beast's skull. Despite Tryndamere's pleas, his elder went out to speak with the strangers; they cut him down mercilessly. From there, they began to slaughter every man, woman, and child in the clan. Tryndamere, the sole survivor, hid under the bodies of his dead parents. Upon their bloodied corpses, he swore eternal vengeance on those who took his people from him - the assassins of Noxus.

To train himself, Tryndamere voluntarily served under all the great chieftains of the barbarian tribes, learning the ways of the barbarian warrior. Not only did this make him the man he needed to become in order to exact his revenge, it has also garnered him friends and allies among the most powerful barbarian leaders of Valoran. This recently allowed him to unite the barbarians into a single, powerful force - all under his command. Now he has joined the League of Legends to earn enough influence to find a permanent home for his people... and to slake his rage on the champions of his hated foes.

"The next true power will come from the far north, and it will involve Tryndamere - one way or another." - Graccus Mightstone, League Senior Political Scholar.

Here are some pros and cons of my guide.

Pros

Hard to kill early game
Has Life steal
Easy farm
And strong auto attack
Every one can play him

Cons

Cant do all the work
Cant BG
Low on HP
Need practice with his Undying Rage

I take Battle Fury and max it first,that gives me a lot of survivability early game.
Next i take Spinning Slash it can be used offensive and defensive i take it 2nd and max it 2nd.
I take Mocking Shout at lvl 3 and max it last its a nice skill and i use it to slow opponents and to lower their damage.
Undying Rage is trynd strongest and weakest skill you need some precise to get the feeling when to use it.

Farming is really easy with trynd you just need to last hit minions try to hit on the right moment and dont be too aggressive early game.
Mid and Late game you can 1hit minions so its not that hard to farm with trynd.

Last hit minions try to get as much minion kills as posable. More gold = better itemes =
easier kills.Try not to be too aggressive and do your farm,at lvl 4 you and your partner cant try to harass more and you might get a kill or 2.
Mid game is your time to shine if you did well at your farm.
Now you and your team needs to gank.
Late game if you or your team didnt feed you can easy win the game.
But if you didnt do well than try to kill the champions that have less HP and target the ones that do the higest dmg.And wait for the right moment to push,get into a team fight and other fights.
Your role in a team fight is to carry your team