My recommendations: make of half of your cities cottage clusters to support a ginormous war machine, make the other half unit pumps. Some heuristics to follow: never give in to any demands or requests, except open borders. Having open borders with everyone will generate lots of ill will towards you, which you can compound when you refuse to stop trading with someone. Found your own religion, adopt Theocracy and avoid spreading it to others. Being a heathen will make you quite unpopular. Follow these self imposed rules, and you won't have to declare war on anyone, they'll come to you!