Quinn is an excellent AD Carry. Excellent in both melee and range. She can go both mid and top lanes in my opinion.

I have a build that I believe is perfect for Quinn, but that's just my opinion.

Pros
*excellent carry
*massive damage if built right
*can speed away if in a bind or catch her enemies
*excellent blinding move
*can spot nearby enemies if they are hidden

Cons
*can have a hard time against tanks
*try not to chace or you will be in some trouble (I learned that the hard way)
*slow during the beginning and too much mana usage at 1st

Starting Options

*Boots of Speed - one thing I always start for (or you can go longsword if you want a vampiric scepter first) gives you good speed for starting

*Health Potions - don't think I need to tell you do I...

*Doran's Blade - you can get this item. You to you. I normally don't get it unless I have to.


Early Game Items

*Infinity Edge - I recommend getting this as soon as possible (I recommend after getting the vampiric scepter tho)

*Blood Thirster - I get it for the life steal and damage, but its a good follow up after the infinity edge

*Last Whisper - good to have for armor pen plus some damage


Late Game Items

*Ruannes Hurricane - since Quinn is a range based champ, get this for excellent attack speed. It even attacks up to 3 enemies!

*Zephry - defenantly recommend this item for increased attack speed and damage

*Boots of Speed (green) - I know you should get these early game, but I usually get late game since I need as much damage and attack speed as posible (up for you to decide when to get)