Hey I am just a old time league player just making a build for a friend feel free to look at take what you like :D. Most of notes are just on the item's part.

Strait forward ADC common runes

I like taking the CDR for graves because of his long cool downs that you need to be up at any given moment.

Look at attached notes on the items tabs looks like ---> (Starting +notes) move the mouse over the notes part and it should show text explaining why I decided to pick them.

Graves has a simple skill set.

Q: great for harass and dealing massive damage to opponents up close
W: good for slowing opponents running away and great for disruption in team fights
E: all purpose, run away, engage a fight or just for fun dashing times.
R: please tell me you know when to use this...

In lane combo:
Simple W---> E ----> Q ----> auto attack/run. With this you can control what direction they run in and do some burst and keep them on their toes in lane.

Team fights:
Graves has great potential in team fights, I personal like to initiate with my ult to strike fear into the opponents followed up by placing yourself in an area where you are protected by teammates and where you can maximize damage with your Q+auto attacks. you get caught you die team fight is over. Position is everything for an adc if needed I can create a video of "good placement vs poor placement".

If this guide needs 'touch ups' I will be happy to do that and if there are people out there that would like more info just post and I will spend more time on this guide instead of the 10mins I gave it. (could add videos + pictures if you want)