Items

Many ppl say Riven is useless, she isnt, just very fragile in early game. Thats why i start the game with Dorans blade. I like to buy the tabi+hexdrinker combo cause it has fair price and nice buffs for early game. (Resist, dodge and shield, we love it) The Warmogs musthave, without u will die by 2 hit. The Atma's gives u what u missed: the dps. After this u can decide, u want to be a tank or buy more dps items. A Ghostblade is recommended, cause she have very slow attackspeed.

Runes

These runes helps u survive in the early game, with masteries the 20 AR/MR and the 80 hp rocks.

How to spam your skills

Usually i jump into fight with Valor and start spamming Q and W. With the Q, attack, Q, attack.. combo they run away or they attack back. With this combo they get stunned twice and your teammate can get in range and help u. After the combo and 1-2 autoattack get out of range until your Valor is available again, then go back stun and start autoattack.

For harrasing get in range with Q, usually hit them just twice - but its enough - and W and go to the brush or out of range with E.

In teamfights cross them with Q (with the third attack try to arrive in on my primaried teammate to stun surrounding enemies) and try to catch the ranged dps with E and W, dont want to kill it, just disturb it. After pull out your big sword from the pocket and help your teammates, kill the nasty one who chasing your teammate or be the nasty and hunt them, u can reach em easly with your Q and W. Your ulti is a perfect exterminator, but use it only on low hp enemies otherwise it wont even scratch them.

SummonerSpells

Flash - Musthave.
Exhaust - The reason why i like exhaust the slow. It gives u time to auto attack him and recharge your skills. If your Flash is on CD u can use it for def also.

Pros/Cons

Pros:
-Spamming skills 24/7
-Good harasser
-U can run away / Get in range
-AOE stun and knockback
-Great mobility

Cons:
-High CD on E and W until lvl9
-Fragile in early game
-No wall dash