This is more of just a build than a guide right now. I'll maybe expand upon it later... but probably not. All the listed runes and items are solid though.

/Pros/

* No mana, which means you can spam your spells as long as you pay attention to your
cooldowns.
* Extremely high mobility, which will increase with your skill.
* Once you ascend to peak Riven play you can weasel your way out of nearly any
situation.

/Cons/

* Difficult for new players to get the hang of and extremely difficult to master.
* Extremely susceptible to cc, especially if you don't have qss yet.
* Most people will assume you have an unsavory attitude.

You can q over turrets and walls, here's a map of those walls. The green is easy to jump, the red is hard to jump, and the pink actually mean only Nidalee can jump it with her w.
Source: http://imgur.com/gallery/KsIxD