Hi im Sande aka Sande but my friends call me Sande. This is my first build post so please leave comments on what i did good or need improving on.
Anyways i have been playing Riven for quite a while and i find this build to be very effective.

Pros:
If you get ahead-> easy to snowball.
Huge shield when building full AD.
Tons of mobility
You can 1 shot people in the late game


Cons:
If you fall behind-> not so easy to comeback
You are not a tank so don't be the first one to go in.
Countered by CC

Farm until level 3.
When you hit level 3 you can start poking.
The easiest combo is E->Q->Q->W->Q->Run.
If you can, auto attack in between all those abilities for more dmg with your passive.
If the enemy does more damage than you then stay back and farm or ask your jungler for help.

You can farm easily using your abilities and passive, since you don't have mana you can spam your skills 24/7

Broken Wings Your Q is you most important skill. You can stack your passive fast with it and also move faster than normal. With the 3rd cast you can jump over some walls.

Ki Burst Is a small aoe stun that does ALOT of dmg, easy to wave clear if used with your Q

Valor Gives you a shield and dashes abit. Not really much to talk about it.

Blade of the Exile Gives you some AD and range on your abilites. Also you get an execution spell from it which you can use once per cast.