Very basic and slightly simplified. For someone that has just stumbled across this game with no experience.
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Here is how the game works.

The basic and most simple way to play the game. Is to build the land you have. Then spend some more turns exploring. Then build the land you have.

Building your land. YOU DONT WANT EVERY TYPE OF BUILDING.
Farmers- Build Farms
Cashers - Build Ent/Res 50:50
Techers- Build Research Labs
Indis- Build Industrial Complexes

Pick one and go for it.

But remember to build some Construction sites. Every 4 construction sites increases how much you build per turn. But 1 construction site takes 1 turn to build. So a good measure is to have around 80 construction sites after playing 100 turns. But you should stop at around 200-300 construction sites.

Now your buildings help produce something
Farmers- Produce Bushels
Cashers - Produce Cash
Techers- Produce Tech
Indis- Produce Military

Now what government should you play. Go to Manage to change this and to see the benefits of each
Farmers- Fascism or Republic
Cashers - Republic
Techers- Theo, Republic
Indis- Communism

Now you Sell what you produce on the public market to gain Cash (except for cashers)

Now you buy everything else you need.
Farmers- Buy military and tech
Cashers - Buy military and tech and bushels
Techers- Buy military and bushels
Indis- Buy tech and bushels
But you need cash on hand to play your turns. So dont buy too much!! Preferably cashers/techers/indies buy enough bushels to play your turns and after playing all your turns and selling what you have produced, then buy some military and some tech.

What Tech to buy:
Farmers- Mostly agri tech, with a tiny bit of bus/res
Cashers - 50:50 Bus/Res tech
Techers- Produces tech to sell it, doesnt need to buy
Indis- Industrial Tech and a bit of bus/res tech

Spy Production:
Farmers- Want to have 5% of their land as industrial Complexes. And under Manage, set production to 100% spies
Cashers -Want to have 5% of their land as industrial Complexes. And under Manage, set production to 100% spies
Techers- Want to have 5% of their land as industrial Complexes. And under Manage, set production to 100% spies
Indis- Under manage you want to have industrial production set to 5% spies.

Once you understand the game you can then try attacking (Land Grabbing). But i wont cover that here.