Quickly writing down this comment as reasoning for my downvote, if you have any questions feel free to ask (or check probuilds.net to see why) - I'm a Diamond 3 support main and can help you if you wish.

Q > E max - overall you should go Q->W->E
0/15/15 masteries are pretty sucky (especially the way you spec'd them)
Runes are poor, just do the math on flat health seals + armor quints vs flat armor seals + health quints. You'll quickly find out that health seals and armor quints are clearly a better choice. Also I'm sure there are better options than armor marks.

Items are decent though, but I'd still remove zeke's and thornmail as they aren't as well fit on thresh considering the alternatives. Mikaels could be moved to situational as the stats don't really benefit thresh (you should only get it if your team really needs it anti cc)

Thanks jmirsk for your comment. And it is no problem that you are critical, because it can help me to improve the guide.

Like the comment above, I agree that there lacks some content. For example, when explaining flash, don't just say that it is awesome. Explain some uses, like flash hooks, flash flays, lantern saves through walls, and things like that. Also, I agree with maxing e, but q should come next. W should not be used for sustain in lane because you should not be building ability power on thresh, so the shield will be very small. You should never want to spam W in lane for sustain anyway because you always want it to be off cooldown and ready to cast, just in case your adc overextends or you want to reposition them in a duel. It is important to max q second for the cdr because even though you are building cdr anyway, you want it asap. I do not do this personaly, but Madlife maxes q in most situations. I understand that this is your first guide, and I know I'm being over critical. Fix these changes and this will be a better guide :D.

Thanks for the comment emoriam. I will try to follow your advices as good as i can.
But like i said this is my first full guide and i'm still trying tho learn this.

Lacks of content and detailed explanations. If you write something like "Jinx has a tripple stun and if you have bad luck the jungler could be bot" the actualy advise on how to deal with the matchups is missing plus the information itself is misleading. Rather point out other AD Carry's capability of movement, early game damage and her unique abilities you need to be aware of.
Besides, maxing Q or E until level 9 is the best kind of skill sequence.