Welcome,

Let me explain how to play tryndamere. first go for the minions, if you're lvl 6 you can play very aggresive cause you have undying rage :D. Than try to make some kills. Always play lane! When you got your infinity edge you will see youre stronger than the other ppl, use that :P after being fed you are soo much powerfull than the other players :). Remember you don't have much armour so make sure you buy some. (Runes and masteries are neccesary!!)

Goodluck!

VERY, VERY important. Otherwhise you don't have a high crit chance. Its good to have these runes cause in the beginning (lvl 2-5) you crit much more than other ppl which is very usefull.

I just use these spells cause i like them, but you can choose others if you want. Example: Heal + exhaust

Its important that you have a good movement speed. Attack speed is not neccesarry. cause you crit soo much. Make sure you buy berserker greaves they really help. Infinity edge is the most important item it gives you much attack damage and crit chance + an unique passive. Later you can buy attack speed which is also usefull, life steal after that + some more crit chance. Armour is necessarry if youre game is very long. Cause otherwhise they hit soo much on you.

Very, Very important. This gives you loads of attack damage and ofc critical strike damage. Which is very usefull. Make sure you get these masteries cause tryndamere is based on crit.damage.

Well its important to use bloodlust, cause spinnings slash is only usefull too flee or to get someone. mockin shout is also very effective, you need this very much cause you chase on ppl. thats your job, scaring ppl. undying rage is also very needfull, it gives you the opportunnity too run away,(use spinning slash). also if someone has low hp and you too. than you can use undying rage and finish them :P.