Guys we should take ideas from different games
From,
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From 0A.D.: u can take many ideas like battlefield with infinite soldiers plus city building nd civilizations.
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From cossacks: we can see tht when cannons fires any building the peices of buildings flies in sky and hurts units.
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From rise of nation (Microsoft game): u can take the territory thing.
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From cities skyline: u can see tht how far we can zoom in and zoom out it would make the battlefield feels so real.
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(Suggestion given by DjBillE) From warcraft and tropico: units actually went in mines so in cossacks
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From 0 A.d: there i noticed tht there was rather than gold metal was available gold is an essential thing but they should add metal too now.