So ADC is my second worst role but I've thought ive gotten a good handle on it. However I wanted to be sure. The general build order I tend to follow is IE, boots, vampiric scepter for a little more sustain, lw, then go for either the BT or Bork out of the vampiric sceptar depending on how ahead or how tanky the enemy team is. Yay or nay? Obviously there are exceptions such as squishy teams, no armor teams, etc but generally how does this sound?
Variks the Loyal3 votesDepends on the ADC. Generally, there's two ADC build paths.
First is similar to what you do. IE rush into Boots, then most people get either Statikk Shiv or Phantom Dancer. The former gives more burst and wave clear while the later gives more tower and teamfight dps. Then Bloodthirster, over Bortk more often than not for the defensive capabilities, then LW.
The other is an aggressive, dueling build, where you rush Bortk. This is for more bursty ADCs like Kalista and Twitch, or ADCs who want early kiting capability. After the Bortk, it's Statikk or Phantom, into IE. Boots are gotten along the way.
Some ADCs also build Youmuu's Ghostblade. This is often for ADCs who have Attack Speed built into their kit, so getting it from items isn't as valuable. Graves, Twitch, and Lucian are the main ones. The active from Youmuu's can either be used for very rapid fire burst (Like a Twitch assassination), or to fill in gaps after your kit's Attack Speed has worn off. Lucian uses it before using The Culling to maximize his amount of shots.
Sukishoo2 votesYeah it really just depends on the ADC that would are playing.
Most ADCs it's always good to go for an 
as the first major item. That works well with pretty much anyone but ones that want it as their first cause they need that harder damage and crit are
ADCs that like early attack speed as they scale well with that and either have true damage or something else to empower themselves work well with 
first. Those are usually 
Other ADCs out there have had some more varied builds that include getting a 
as the first time, such as
And of course after those, then there's 
(general boots) 
(good for Corki) 
(good for Lucian, Ezreal)
then you can go for any of these 
/ , 
, 
and usually a 
is good for the very last item.
DarthSpectrum2 votesDepends on which ADC champion you are playing really.
There are generally 3 starts:
Most ADCs go for an early Infinity Edge for the power spike. Those that rely on AD scaling abilities such as Ezreal and Corki opt for a Trinity Force. Hyper-carries (high DPS, % health damage procs) rush a BoTRK to get more of their procs off.
(Buy boots as you build your first item - it helps tremendously with kiting) After that, it gets a bit more complicated.
Assuming we went with start one, in most situations we will follow up with a Statik Shiv or Phantom Dancer. Afterwards, we would get a BoTRK if the game is evenly tied, or a Blood Thirster if we are ahead.
Then we top it off with a Last Whisper for the inevitable armor late game, and a Guardian Angel for the passive. However, it is an option to forgo the GA for one more PD or SS if your team is really ahead or have good peel. Still, it is not recommended. Against an enemy team with a Zed or high CC, buy a QSS into a Mercurial Scimitar in place of GA or SS/PD.
For Vayne, the build is pretty much the same except BoTRK is built first. For Kog'Maw though, most rush a Trinity Force into BoTRK then into IE, leaving out SS/PD. Corki has generally the same build as Kog'Maw. Lucian and Vayne can swap out PD/SS for a Youmuu's Ghost Blade if they wish to.
Ezreal builds Tri force first; however, he must buy a tear very early on to stack it into Murumana, which replaces IE.
Most ADCs should get AS boots. In situations where the enemy has a ton of CC or magic damage, ADCs can switch their boots for MR boots instead. Corki builds magic penetration boots and Ezreal builds CDR boots since they are mostly AD casters.
Oh yes, also don't forgot to upgrade your trinket, be it red, yellow, or blue, after completing 2 to 3 items. They practically pay for themselves and saves you a lot of gold.
Miku Lv992 votesTry this: 
Reign L91 votesYou might wanna include a somewhere in your build. Damage is good, but it scales much better combined with attack speed and crit.
Swollwonder1 votesI tend to get crit items after I can deal with tanks to keep them at bay personally. So crit items besides IE tend to be last