Trading with efficiency

Have you ever imagined farming in 100 cities?
It's possible, but I'm sure you work or study. Then you have to find another way you can obtain many resources without losing so much time.
The solution is trading with yourself. Yeah, find a good trade in the market can consume a lot of time and they usually are far from your cites. Since your cities are close to each other, then trading isn't a problem.

First things you should know:

• Slingers cities: they lack in stone.
• Hoplites cities: they lack in silver, but let a lot of wood behind.
• Horsemen cities: they lack in silver, but let a lot of stone behind.
• Birreme cities: they lack in wood, but let a lot of silver behind.
• Light Ship cities: they lack in wood, but let a lot of stone behind.

Now, you'll trade between your cities. I recommend to choose one or two cities to send the resources and cast Pop Growth or Call of the Ocean on them. If you're not very active, then a market level 20 will help you.
I usually don't use the trade tool, but the regular trade, because I can see how many resources I sent and how much space there's left. This strategy works if you're cities have at least production camps in the level 30(silver mine can be upgrade to level 40, so you can store more silver):

1. Select a city group and choose a city that you pretend to send resources. 
2. Send the resources and click to the right to switch to another city.
3. Send the resources again and repeat the process until you fill the selected city with resources.

I give you my example:

1. I click in the overview, then in recruiting.
2. I choose the birs group and make birs.
3. I go in the LS group and cast CotO in one city and assign Aristotle to that city.
4. I send all the wood and silver from my LS cities to this city.
5. With the hero assigned. I make the LS and keep sending resources from the other cities.
6. At the same time, I go to a hop city with Chiron assigned and train hoplites there.
7. I send silver from the others hop cities and from the birs cities.
8. I repeat the process with the others cities until I finish the resources.

New cities

Depending how do you upgrade them, they can be good or bad cities. Before you start building your army, you should put a city in a stardard level. For example:
Birs city: upgrade the academy to level 13 to unlock birs. And then upgrade the production camps and warehouse.
Ls city: upgrade the academy to level 16 to unlock LS. And then upgrade the production camps and warehouse.
OLU city: you don't have many choice, but to farm until you unlock conquest and others researchs.

Production Camps without trading

This strategy are for those who don't have time to play, so it'll be better to train your army without worrying about losing resources.

Slingers:
Quarry 40
Timber 30
Silver Mine 25

Horsemen:
Silver 40
Timber 34
Quarry 20

Hoplites:
Silver 40
Quarry 22
Timber 20

LS:
Timber 40
Silver 27
Quarry 20

PS: The level can change according to the island preferences. I put the minimal level in 20 because you have to upgrade your city.