Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
I ALWAYS get Doran's Ring and Mana potion first then run top/bottom. I use Light Binding to pin the careless target for my laning partner - I say 'careless' because the low health person may not ever walk forward so you may have to harass the hell out of their tank. I recommend staying in your lane - or running for ganks after lvl 6 - until level 7-8. Usually by then you can snag your Mejai's and boots, if not Sorceror's shoes. I follow the item sequence exactly, I've never gotten it out of order and unless my team doesn't play as a team I do quite well. My last game had a Feeder ashe and I still made out 5/8/20. Once I finish Archangel's, I sell Doran's Ring to finish out the build. I'm yet to get all the way to Lich Bane but I've gotten everything else in 5/6 games.