Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
At the beginning of game. Save your first shot on your enemy. Basic attack + volley would gets the enemy down to around 50% health. If your enemy is fairly low and is over extending. do a volley and flash forward and chase with frost shot. Exhaust if needed. This technique is even easier to complete with your ulti.
TEAMWORK! The key to a success 5v5. Remember that YOU are the support dps carry! So survivability is crucial. Always! Stay behind the tank or outside of the fight while still in range to shoot (remember to have frost shot turned on). Ashe is also a great initiator, so try shooting your arrow before the fight begins. If your team's getting raped, try saving your team mates by slowing the enemy down with volley or frost shot. Your boots of swiftness + the phantom dancers should give you enough speed to kite the enemy. Flash if necessary.
REALLY IMPORTANT! how well you farm in early game will reflect on how good you do mid game and late game. Thanks to the doran shield's health regen. You're able to stay in lane longer . PRACTICE YOUR LAST HITTING! B.F. Sword is a pricey item but will help you a lot on your last hitting (also raises dmg on volley). Whenever you have a chance to kill a minion or hit the enemy. KILL THE MINON! (Unless you're sure to get a kill) it's better to gain 17-34 + 1 from hawk shot than the deal 60 dmg to your enemy.
i personally love having flash and exhaust. Thanks to the phantom dancers and boots of swiftness, you're able to run REALLY fast. Flash can help you get out of situations like being ganked, or to get some distance in a "flash". Exhaust is mainly use to weaken your enemy so you take less dmg, and in some cases to escape. Ignite is also an option to get due to the dmg over time and reducing health regen. which ever is good. it would be the player's choice.