This guide is basically for ppls struggle in bronze/silver/gold. There's no hard tricks for Cho.

You can totally pick AP over movement speed, since once you launch your Q, mostly there's no way that champ can escape. AP rune will give you a strong start, but as you will see in the following chapter, I think movement speed is more suitable.

Nothing special here.

The fourth item should be FH or SV, the fifth is Abyssal Scepter, of course, they depend on the situations.

DON'T rush your level one ability. Pick Q if your team decides to invade or counter-invade. Pick E if everything's fine.
I know Q has more damage and shorter CD, but it's easy to dodge, so I main W. The level1 E is for pre-level-3 fight on lane and farm.

Undoubtedly I pick flash and tp.
Remark: tp on a ward + homeguard boots= easy feast on their carry.

Pros:
A simple champ, very straightforward.
Perfect sustain in lane.
Easy to cooperate with a gank.
Quite tanky as a AP carry.
Have good cc and burst.
Good AOE in team fights.
Cons:
Not effective when against tanky top.
Needs a little anticipation for Q.
Ugly, boring and simple-minded champ.
No one would compliment you even if you outplay them, because there's nothing as "overplay" for Cho, just everyday routine.

Just take cs before lvl 3, use Q to take cs if necessary(at most twice or it would be a waste of mana). Once you reach level 3, you start to poke your enemy as well as taking cs with W every 10 seconds. It's very easy. Once hit by W, the enemy is silenced so they basically can't trade with you with their ability. Most champs don't have enough HP to sustain this poke. Once they are low, you can easily zone them. Then the only concern is their jungler.

The easy way to avoid get ganked when you zone: buy a ward in the river.

As Cho, when you have no ward in the river, you can escape even jungler come to gank you. The trick here is: do not waste your Q, use it when he jumps on you, put Q right underneath yourself, then flash. Once you burn your flash, you have to buy a ward when you oom!

When you are relatively low in lane, I suggest you stay in push and just take with your W as well as poke your enemy, do not risk your life for cs.

One more suggestion: when you hit lvl6, don't hesitate to use R on a minion or a monster (golem or wolf, if you don't want your enemy know your ulti on CD. However, your enemy can easily know if he checks your statue). It's very important to get 6 stacks ASAP. You can simply ask jungler to help other lanes while you just stack your R in lane. Basically, no one can push Cho out of lane

Although you can be very BIG, do not think yourself as a tank in teamfight! Just let others initiate, make sure you launch a good Q(at least hit 2 champs or one of their carry) and E(on their AP carry), R on their carries or low-health fighter or assassin.

Remember, you are not a Tank, so don't play as one.

Your Q+E combo can has both silence and cc, when is very good in team fights. Actually, it would be hard to miss your ability in a team fight, because people do not focus to dodging Cho's ability in team fights (my experience).

This is the basic strategy. Of course you can peel for ADC if your adc is fed or try to burst their tank if he's isolated.

I use Cho to rush from silver to plat with more than 70% win rate in 40 days. I don't know why people don't ply Cho nowadays (because it's too boring?). I think it's not hard to climb out of elo hell(for silver and gold players) playing Cho, so I share my experience here.