I choose exhaust and flash, helps when I need to catch up to someone just to kill them, or run away if needed. However, Teleport, Ignite or Ghost may replace these. Summoner's preference.

Another easy build to go for, better for jungling is, to start with Q, then E then W. Q every chance you get, And Ultimate when you can. When you can't get Q, go with E. Then save all W for the end. More damage, less catching up to people. Your choice.

Pretty simple, but varies depending on who you're up against. Versus a ranged champion, be careful, you don't want to get harassed too much to start. So against someone like Urgot, or Rhyze, just play some D, get some last hit on minions for money, but ultimately, let them push your turret a bit, and when they get there, Spinning Slash their minions and get the money you can. Continue and Repeat this until your about lvl 8.

This changes against a melee champion. Versus any melee class, what you need to do is still, get minion kills, but when you know they are coming for you, get in one a hit or two against them. Chances are you'll get a lucky crit and they'll play defensively, letting you do what you want.

This is where you begin to get levels on everyone. As soon as you get Zeal, Berserker's Greaves and a vampiric sceptre, JUNGLE!! Trynd is most likely the best jungler i've seen at this level. Between the heal from Vampiric sceptre and bloodlust, you shouldnt fall below half health, and you can always get every buff on the map. Just be careful for Ganks!! And when you need to either get somewhere fast, or escape, dont forget your Spinning Slash can go through a LOT of the walls.

Jungle as much as you can, stealing minion kills when you want. This'll ensure your max amount of money, and if you do it well, you should hit 18 about 2-3 levels ahead of everyone else. Dont forget!: you are still part of your team!!! Just because you're jungling doesn't mean you can't pop out for a gank, or run over to help a fellow teammate escape. (W move is very helpful for that)

End Game is all yours. Between the lifesteal, (up to 50%) and up to 1.3k crits, nothing should stop you, except maybe a 3v1.. :P However, always be cautious of where everyone is on the map, and ganks that may be coming for you. In a team battle, Trynd has the capability of at least 6 secods (due to ultimate) of killing. GO FOR THEIR SOFTEST PERSON IF THEY ARE DAMAGING!! This'll greatly help your team by getting rid of most of their damaging people. You should tear through most people in about 5 or so hits, unless they have a decent amount of armour.

Dont forget!

1. HELP YOUR TEAM
2. Doesn't matter if someone steals a kill or they steal yours, YOU ARE A TEAM!!!!
3. KICK SOME ***!!!!!!!

Pros

Best Carry I've Seen
Will get many kills in a game
Hard to kill at the end

Cons

Thornmail destroys you mid game
People dont like you because your'e too good :)