Riven is a very powerful top with easy sustain when you get wriggles you want to bully the opponent as much as possible to get kills and deny them gold dont be frightened of ganks either riven does well to escape them.

Concentrate on CS and map awareness as they will be key to your movement when and if you have pushed the lane to far then wonder to mid for a gank when you see possible but only when you have pushed the wave when doing a gank do this sequence follow in with E then 1 Q then W for the stun then QQ and if needed R but if mid is doing there job properly mid should be ded b4 you get to QQ.

by this time you should have a decent build ( atleast phage and wriggles ) now you have become dangerous with the passive of phage and the life steal you can roam as much as you can to get team kills and gold also dont be scared to wonder into the enemy jungle and take there red. at this point you need to get health MR and armour.

now that you have the armour health and MR you want damage so go for a bloodthirster and maul this let,s you junp straight into teamfights and come out the with the victory.

You have just won the game.

ignite and fash are key to winning Flash lets you catch or escape those times that you hope dont happen.

when with your team its you and the junglers job to deal and take as much damage as possible you must protect the carry,s while your in a team fight try to hit as many enemy champions with W then R there health will burn down so the AP and AD carry can kill.