Sounds like fun, although, a few hours ago it seemed like the auto attacking was automatic (Oh the irony), is there any way to turn this off or am I supposed to hit n' run each time?
He was basically the only champ I played well from levels 5-22, until I bought Fizz "The Miz" Rock Johnson. As such, I'll see if I can share what I learned from builds I searched up and personal gameplay :o
First thing you should know is that, regardless of what many people say, ap/as teemo vastly outranks ad teemo. You're there to pick people off, not dps on the frontline with lifesteal and ad. Your ap/as will let you rip through people before they even notice, or just let you dish out crazy damage while your team cc's.
I think the main thing I love about this kind of build is that it directly counters people who are normally extremely annoying such as yi or tryndamere, because you can blind, slow with shrooms, and barrage them to death with your speed before they can do anything about it.
Anyway, you'd usually start with a doran's blade(never start with potions, because teemo shouldn't be doing any more than last hitting in early laning phase), then build Mercury's Treads/Berserker's Greaves(varying based on whether or not the enemy has some strong ap carries), then two daggers into malady, that speed bow thing into wit's end, until this point.
Now you should be right around mid game, so this is when you choose whether or not to keep building into Bloodrazor or to build a defense item first. If none of the enemies are particularly fed, I suggest Bloodrazor, then start building into frozen mallet. At this point, go for guardian angel, as it's extremely useful in late game.
tl;dr - doran's blade, merc treads/zerker's greaves, malady, wit's end, defense item or bloodrazor, frozen mallet, guardian angel.