There's quite a few things you can do. - Sell luxuries to the AI, preferable those that you have multiple exemplars of- Sell strategic resources to the AI- Build you cities on rivers and next to luxuries that generate gold (and work them of course ^^)- Build as many markets as you can (and a bit later: Specialize a (few) city/cities to making gold. Build a market, build trading posts etc.)- Connect cities with roads, but not too early or you'll lose money as every tile costs 1 goldYou might also go barb hunting, every camp gives you gold. However, as units are really squishy in vanilla Civ 5, you have to be careful. On the other hand, there are also some things that you might stop spending money on, if you did so far:- Don't put army-production/EP buildings into every city, instead, specialize a single city to army production- Don't over-produce army, instead try to keep your army small but upgradeetc. etc. . The best way to get Gold if you only have the normal Civ V is to go to the store page and buy the "Gold Edition Upgrade" that way you'll have Gold.. Yeah, I make pretty mediocre amounts of GPT unless I am in a golden age or sell my resources to the AI. Best solutions tend to be either expanding territory by taking over a neighbor and making a bunch of gold puppets or just keep selling stuff..