Need help with Graves

I've always been a meta slave. I played shyvana when her w did 20% bonus damage to non champions. I played kha'zix before the small nerfs to his q. Now, I'm trying to spam hecarim in ranked for that freelo. After seeing graves rise in popularity on a bunch of different websites, I decided to give him a shot (if you haven't figured out by now, I'm a jungle main. Also, as a side note, I'm bronze). I played him a few times in ranked, but with very little success. I have a difficult time trying to maximize my damage when I play lethality builds, because graves has a relatively short range, so I often find myself being zoned very hard. In teamfights, I always get bursted really quick. I have no trouble accomplishing a healthy clear, but my clear on graves lacks efficiency because I am terrible at his animation canceling and his mechanics in general. And even when I get fed by stealing kills from my teammates with my ult, I have difficulty utilizing my lead, because as I stated above, I always get zoned really hard because I easily get bursted.

Oh god, lets not get started with the ganks. I'm used to playing champions with really easy ganking methods, like hecarim. Press E. Press ghost. Run in behind target. Click desired target. Click w. Mash the fuck out of your q button. Have a cookie. Graves is so much more different. In order to maximize your damage on your target, you have to animation cancel properly. One thing I really hate about ganking as graves is that I keep forgetting that your bullets can get minion blocked. I can click on the target champion, but if he's on the opposite side of the minion wave, he won't take damage.

So I guess the questions that I'm asking are how should I change my graves build so I'm not getting zoned and bursted in teamfights, and so that I'm still dealing as much damage as possible? How should I path, and how should I be ganking? Any advice is appreciated.