Seriously, just look at her. Replace the shield and hammer with a pokeball or two and put a cap on her. Looks like someone you would run into as a rival.
First thing is first is that take all item builds with a grain of salt. If you are terrible at approximating your health, or if you don't know the weaknesses of a regen build, or if your lane composition isn't right, no one build is going to cover everything. That being said, what I have been playing lately with poppy is a double philosopher stone regen build, focusing on my mid to late game. How this build starts is with a regrowth pendant and a mana potion. From there, you head out into lane, choosing heroic charge as your first skill. The reason for this is that because it operates as a stun (since everyone bush hugs anyway), as an escape, as a way to save an ally who facechecked into the bushes, as extra damage, basically as everything you could want as a level 1 skill. If you have a carry in lane with you, you are going to let them get as many of the last hits as they can, as the focus of your build is to get indirect gold and player kill gold. When you get enough gold to go back and buy your phil stone and boots, go ahead and blue pill back, unless you are so beat up early on that you need to go back and buy, in which case just get your phil stone. This goes for your 2nd trip back, in that you should wait until you can upgrade your boots to level 2 and get your 2nd phil stone, although this ideal may not happen. It just depends on how well you and your lane partner are farming the other team. Basically, priority will be 1st Phil stone > Level 1 boots > 2nd phil stone > Level 2 boots. The reason why I don't give specific boots is, as all things, boots depend on gameplay. 99 percent of the time, however I end up using Ionian Boots of Lucidity for the CDR, being that with the new Tenacity stat, I can upgrade one phil stone later to an item with tenacity for next to no gold.
From here, you are going to start working towards your trinity force. Start off with building components of sheen. With double phil stone and reasonable gameplay, you should be able to buy a component or two of trinity with each trip back, always improving your characters stats. After you get your sheen (which will make you a burst, tower diving, killing machine) work into your zeal for improved farming and movement speed, and finish with your phage, and finally completing trinity. As the final item of most games (just because of time) you will be building deathfire grasp, because if you remember, it scales with your ultimate, knocking huge chunks of health out of pretty much anyone. Start of with a Kage's Lucky Pick, as your farming is still average, even with Trinity, and then working into your Fiendish Codex. From here, you will notice that with CDR, you are hitting A LOT harder. Being able to swing faster with your Devastating blow will massively increase your DPS, so, naturally, after completing DFG, you should keep yourself blue potted the rest of the game. This is the point where you upgrade your philosopher stone to a Eleisa's Miracle, giving you tenacity, and with any over abundance of gold, focus on survival items, like a banshees veil or thornmail.
Lane Partners determine A LOT of early game play and really will steer how much freedom you have to wander (given that you don't really last hit anyway and have phil stones, feel free to rape other lanes). While I would like to give a set strategy for this, there really isn't. If you have a spin to win garen and are wall slamming your oppponents into oblivion, you will have a lot of spare time in your lane, as it will go down quickly, so feel free to help other lanes. If you end up with a ryze and can't put anyone down, you will spend a lot of time on your tower waiting for assistance to push back. This is just something you have to get a feel for from gameplay. When your tower goes down, you basically just go to any lane that has a char that has weak or little CC, ult them, whether they are on their own tower or your own, and crush them. As for late game play, well, I am going to cover that in Part 3, as well as masteries since I believe I forgot them. See ya tommorow!