Listen here, this is not a beginners build. If you first pick lulu for the first time and use this build, you will lose. This build is weak early game, however this build is meant to scale towards late game.

Let's get started on how you utilize this build. Before I start, I need to tell you something. Mana consumption early game is CRITICAL. Since you do not have biscuit delivery, mana consumption is very important. You can't instantly E and Q and enemy. If you do this, your mana will disappear by level 4. Play it smart people. use your q to slow down your enemy and get some auto attacks in. Don't be greedy either. Sometimes one auto attack is good enough. Depending on how much minion agro there is, you might not even auto attack at all. This can backfire really quick and you must play it smartly. If your adc is afk farming, i don't recommend you q at all since your slow will not be used to it's fullest. Using your E would be the best thing to do in this situation. You need to communicate with your adc and tell him when you Q, he should atto attack whomever you are attacking.

Now let's talk about guardian. Do not instantly E your adc with guardian. For the most part, the enemy wants to make a quick trade and want to continue farming. A great way to use your guardian is if you use it against Ashe's W. It keeps both of you safe and you don't take any damage since it is all absorbed by guardian. Also, guardian gives you a little bit of movement speed so it is very great against ashe's W since it slows you down faster than my computer's processor when it's trying to play 4K video.

These are just some situations in which you can use this lulu build. Keep in mind, this is a very defensive build and I choose to pick overgrowth since it gives you about 300 hp into the mid to late game. If you are a fed lulu, you're left with almost 2K hp which is really good. Overgrowth along side with bone plating, this should make you survive a bit more. Thus, making you more useful in the mid to late game. By this time, the enemy adc has about 50% crit and their midlanner has deathcap. This build will prevent you from getting one shot from most champions.