Hello summoners! I'm gameman15 and this is my first build guide. Please comment about your thoughts, I would like to know how you like about the build I like to use. I hope you enjoy.

Pros

+Huge Nuke with Q
+Shroom stands for nuclear bomb in full build.
+Its a yordle, yay for that.
+Can be played as clever escaper.
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Cons

-Easily bursted down.
-Can be left behind if doesnt get CS, kills or assists at all.
-No any good escape mechanisms if many ppl ganking.
-Can leave own team hungry from items.

I'd go with 21/0/9.
Taking CDR, AP, Magic Penetration & Damage in Offensive Tree.

From Utility Tree I take Movement Speed when not in Combat for quciker running to the lane, little bit mana regen, CDR on Summoner Spells, CDR on items a bit, and buff duration.

For runes:
Greater Seal of Armor x9 To reduce damage of AD champions.
Greater Quintessence of Ability Power x3 For more AP.
Greater Mark of Magic Penetration x9 To penetrate magic resist and deal more damage.
Greater Glyph of Scaling Magic Resist x9 To reduce damage of AP champions.

Caution, this build's text is alot WIP, also runes. If somebody could give me hints, I would be thankful. This is my AP Carry build for Teemo. I'm gameman15, peace.