This is just a quick GP guide. Since I don't know how to use the item editor satisfactory(yet), I am going to give the item list here. You start with a doran's blade, should should farm in lane (use parley as much as you can to help you in farm) till you have enough gold for boots and philosopher's stone. After you get these two keep farming/harassing enemies as much as you can. The next item should be giant's belt and then mercury's threads. Then you go for the Atmas(get the armor first). Next item should be sheen or phage (depending the situation). After you finish trinity force you can get either infinity or bloodthirster. The last item can differ depending on the situation. I would go for phantom dancer or force of nature.