http://imgur.com/FCny1w5

What you want to do in the lane is: Farm with auto attacks, try to poke a bit with them aswell. When you reach lvl 3, try to hit spears (The distance doesn't matter). If a spear connects, you will hunt the target! Because of your passive, you will get 30% increased movement speed while running towards hunted targets, and your Pounce (W) will have increased leap range! So what you want to do is: hit with a spear, change to cougar form, jump to your target with W, deal damage with Q, Deal damage with E and jump back out with W.(All this happens in like 1-1½second when you get the catch of it) The reason you can do this is, if you hit a hunted target with R, the cooldown on Pounce/Jump(W) will decrease to 1second !! so it's like Renekton slice in, W + Q aaand dice out.
You would also want to place some traps around, well placed traps can give you more poke opportunities, because ! traps also "hunts" the target! so if they walk in a trap, you get vision and more movespeed if you run towards them, then you can do the exact same combo as if you hit with a spear!

Pros:
Great Mobility
Decent Poke
Amazing Burst
Good Sustain
Melee And Ranged

Cons:
Kinda squishy
Takes some time to get a hang of the playstyle
No CC!
Really weak, if you miss spears!
Single Target Only.

Hey duuude, all her skills scale on AP, she does not scale on AD anymore, bro wtf?
This is something you might hear alot in champion select or ingame.
She scales on ad, just as she did before....Takedown !

I know only Takedown (Q in couugar) scales on ad, but the scaling is amazing ! 100% ad +1.5% pr. 1% hp the target is missing, and another 33% bonus if you are hunting the target aaand + Trinity force. If you have Bork and trinity, and use Takedown on a target which is hunted and has 50% hp left, you will do around 600-800 damage ! or even more!

Another thing is, if you build her AD, people like to build armor against you, but ! all you skills does magic damage so its cool, you will destroy them :)