Okay so as Graves, abuse the fact that at level 3, with 2 levels into Q, You have some of the highest poke/burst as an adc, always be agressive if you have a good support and aren't behind, manage your mana: It's good to get out a lot of harass but your q has a high mana cost for your low mana pool, and lastly in lane zone on your own, by keeping your passive up and using the 30 extra mr and armor to your advantage, As for runes and masteries, I prefer Attack dmg Reds, armor yellows, mr per level blues and 2 ms quints and one armor pen but thats just me, (you can just take 3 armor pen quints) and masteries are just standard 21/0/9 masteries or 21/9/0 depending on if you can manage your mana well enough not to need the mana regen in the utility tree... Add me on league for more advice if you want. (I'm not "Pro" but i play a very good Graves IMO)