Basically there's so many people who asks me how I play Riven, so I decided to make my first guide about her since I've been playing her for aroun 1 year now.

Just buy what your doctor prescribed. :^) If they have a fed AD buy Omen if they have a fed AP buy Mercurial.

You'll almost always want to start with your E since you can't trade really well at level 1 so it's better to just play safe and last hit. The champions you can start with your Q are Yasuo, malphite, Cho'Gath, Aatrox you name it all melee champions exept those with poky abilities like Pantheon. And we can Sion in with the E start class :^)
The reason I choose to max my E and W before my Q is because the cooldown gets reduced the more you max it. fak the Q dmg.
And oh usefull tip don't E --> W since you'll just be waisting your shield it's better if you Q -> W if you want to reach them into the stun range.