I said that only take the Sorcerer's Shoes - Homeguard enchantment if you are being pressured really hard because they will help. This was a rather safe build, that was the whole point. Getting Void Staff is something I will consider but Guardian Angel isn't really selfish - it makes getting through the fights a lot easier and you can easily escape or waste more time when GA is popped if you have flash and Zhonya's Hourglass and you can stay in the fight longer. Thanks for the help with the Masteries, I didn't sit down and do the math with it so I wouldn't really know - I just generally run it because if I need a more defensive build it can help. I'll probably end up elaborating but before the minions start rolling in there really isn't much to do if you aren't invading. I could spend hours on things you COULD do before the minions start rolling in but that would be a waste. I will clarify and probably change the Masteries. Thanks for taking the time to comment.

I've looked through this and this guide looks like it has been rushed.

Your Cheat Sheet

1. You say in your note for rune that those will give an advantage against squishy midlaners. Given that in general in midlaners are suishy. Due to the fact they have no real sustain, the short length allows them to get back to lane faster and that you can gank efficiently top and bot.
I think your quintessence and glyph choice is questionable and that you don't explain it makes it worse.

2. You put Sorcerer's Shoes - Homeguard into your first back but I think you shouldn't purchase as a first item boots with entchantment ever. Your jungler can hold your lane if you must back early and if the whole enemy team is there, normally your team should group then mid lane as well.
GA is a rather selfish item and I would replace it with a Void Staff or Rylai's Crystal Scepter. Ahri is a safe pick; long range skillshots, CC and 3 dashes as ultimate. Item section would be necessary.
Everyone who has played the game a bit, knows that you can only buy six items.

3. Not everyone reads the notes. Add a brief skill sequence section or note it in a section.

4. Why 9 points in defense tree instead of utility? Enchanted Armor is a bad investment: You gain with your build 100 armour and 50 magic resistance and 5% extra are 5 amour and 2,5 magic resistance.

Actual Guide...

Tl;dr at the beginning...it's like you don't need to read the guide since you summarize it already.

To make your guide more appealing, use bbc code. There are a lot of guides out there.
For example [[zhnoya's hourglass]] and it will look in your guide like this Zhonya's Hourglass.

Content

1. Intro it's there to introduce the champion and present yourself. Don't make yourself look worse before the readers can judge you.
2. Starting Out is kind of confusing because you explain more how to invade.
3. Laning Phase the first sentence sounds like you mustn't harass the enemy laner pre 4. That's a very passive play style. You should explain how you gain with this an advantage over the enemy. There's no ability chapter. How should a beginner know what Charm is and work. With Doran's Ring you gain through last hitting mana. Use this as argument to last hit properly over fighting.
4. Mid Game Spelling/grammar errors.
5. Items divide it into sections. BBC coding is always nice.

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There is still a lot to do.