Teemo is annoying that is all there is to it he can split push he is an anti-AD he has impressive damage and a dot with each auto attack. That is not to mention the free wards after level 6. Playing against a Teemo is one of the most infuriating thing of all time in league of legends you think you get away from a fight only to run straight into a shroom.

Ok for items I build lane control items (Wriggles Lantern) this will allow you to stay in lane for a longer time and give you more creep kills. Then Damage/Health then Attack Speed/AP then back to damage back to attack speed then you get rid of wriggles for another lifesteal/damage item. This full build (with the Blood Thirster) allowed me to kill an ultied Alistar before he got to his spawn pool from mid inhib.

For Summoners you can get ignite and spec into it or teleport there are other ones that you can get but i like flash and tele. it gives teemo a lot more utility it will allow him to push multiple lanes at the same time and with your shrooms you can teleport into brush and surprise someone.

This is one of the most fun ulties of all time. You can ward the map give yourself a path to run away and wall off your opponent from running away. Like i said before it is the most infuriating thing in the world to get killed while running away by a teemo shroom. The other side of that coin there is nothing more amazing then getting a kill or assist from your spawn. When you have someone from the other team yelling at you trust me you are doing something right. Also Teemo, like himer, can passively push a lane if you put your shrooms in the middle creeps will kill themselves for you giving you free gold and stop pushes in lanes that you are not in.

Teemo's passive is so fun to use you can sneak up on people and you can hide from people trying to find you to escape.

In the early game you are weak you have like 400 health and there are certain champs that will 2 shot you so you need to play a little passively this applies to team fights, if you a carry you should never be the first to die let you tanks take aggro let your support protect you and if that happens you will be able to take teams down by yourself. This is the rules for every single team fight for every single carry. If you do get targeted (without cc there is nothing you can do about cc with this build) flash away and run...after the other team reassigns a target go back in and do your thing.

So hopefully this helps you out when you are using Teemo this is a fun build and a fun champ play safe is the best advice that i can give you stay alive and you will be able to ruin a team that is all there is to it.