Teemo is what most will say a troll pick or a godly gift if one is good.

Gorilla Warfare teemo is my support style that works in phases. The goal is simple, but have given me a descent winrate with 15min surrenders just from harass and lead gained if done correctly.

mobalytics 20/3 winrate

Flash, Tp
Flash as engage/ escape tp because your shrooms allow you to get anywhere on map if you died or someone needs help map pressure is a great thing.

Electrocute keystone
Auto Q auto with proc is ******edly op currently especially against people who dont build resist like a bot lane.

level 1 electo 3 auto poke ~2 second trade = (58 ak damage + 19 on-hit poison)x 3 (3 autos) + 60 electo, total in ~2-3 seconds 291
aery level 1 40 magic damage + (22 on-hit + 58 ak damage) x 3, total 280 in ~2-3 seconds

granted aery will jump due to poison again after trade for additional 40 damage at level 1, but I found ravenous hunter allows for sustain and is more beneficial.

I will update this as time goes on and my motivation gets there, lots of stuff to add to polish this guide correctly.

Grab spellthief and pots if its a sustain lane or really any lane your vsing or faire charm if you tend to poke more, not recommended normally. Ability start goes E, why? because the 4 second damage is more consistent and uses less mana for q's later. Your autos will hurt and your Auto Q auto hurts even more As you level E first.

After helping jungle take the bush go invis and do the teemo thing your goal is to punish your enemy for csing or harassing or even warding everytime their in range auto at level 2 start combo 1, Auto, Q, Auto. sustain lanes will out heal you but your poison is what will be there undoing most sustains don't wait for the poison to finish and so the heals are inefficient or any other lane will just slowly get to a point that they cant step up to cs. if they get to 60% hp on adc or 50/50 on both with you and your adc at 65%+ I would try to all in if its sustain all in at 10% mana and 50% hp. If the support is a tank with lock down bait it out. Really this is typical beginning stuff not really the play style.

level 6, its time to start the real game by now you should have frostfang and boots with a tome by now if not your laning is subpar and need to harass more, harass = gold. depending on how much you have seen the jungler will disside shroom placement if he comes its river entrance. If not shroom bushes and entrance still. Your goal is to punish and get your enemy out of lane and if they chase punish them by walking into shrooms. when they leave shroom dragon and their bush near dragon. time to take control of river. coordinate with your jungler to find time to dragon. Trinket ward behind dragon pit if your north spawn or ward entrance from blue and trinket ward or shroom bush from mid lane if your south.

build into torment first if they item against you or tank support, go tooth if not. your goal is the 9 second shroom. If they dont item against you well its true damage for anyone at 38 mr or less at torment and boots.

after taking dragon and tower time to move into jungle. Shroom enemy red or blue depending on side its your buff now. Use blue for more shrooms and red to harass and cs when your adc is gone.

Now your taken half the enemy's jungle from the jungler and unless he is doing stellar vsing the other 2 lanes he will fall behind in exp. keep the pressure by having bot lane constantly pushed using shrooms to weaken waves on bot and even mid lane if the tower is taken. shroom their jungle entrance so you know who coming out and see the damage unfold. If the enemy focus top/ mid push down bot tower for inhib force them to deal with you and go into jungle an disappear. Same with mid tower/inhib, shroom lane entrances if they leave base they better be damaged by a shroom. shrooms should constantly be at dragon, baron and entrances from base along with in bushes to buffs they go into the jungle they should soon regret stepping into teemos jungle.

Really thats the jist of it lots of little things that go with experience and could explain the teamfight aspect of teemo along with more situational stuff, but its late for me and need to rest so will finish later.