Ok i'm mastering regent at the moment and can win pretty easily so here are some tips.
- I never bother to trade early on. Beeline for literature and Great Libary. Forget about trading, other than for bronze working and masonry. Start the capital with Pyramids and then switch to GL.
-In your capital first build a couple of warriors, then settler, warrior(fortify), then granary, then settler, settler, warrior, wonder.
-The settleres should build their cities some distance away and build warrior(fortify), warrior, settler, granary, and more settlers for a while.
-Organize your cities in some sort of grid pattern. Its okay if they overlap a bit, if you build in a grid pattern cities will be evenly spaced and things tend to work out better.
- If you want to see an example of grid pattern, download Bamspeedy's regent game in HOF, and check out the 10Ad save. he set up his cities in the pattern i'm talking about.
- Unless you got a good ancient UU, (mounted warrior, imomrtal, legionare, jaguar warrior) don't war in Ancient times. Just expand.
-Have cities with atlest one defender and later another one(spearmen).
-After you really don't have much space, and for the desert cities, just produce temples, and then granaries.
- Improvements that should be built- aqueduct, hospital, marketplace, temple, libary(not needed), bank, cathedral(only on border cities), factory, hydro dam, recycling center, mass transit
-Best Wonders to build- Great Libary, Pyramids, Leonardos, Bachs, Theory of Evolution, UN, Hoover Dam.
The other good wonders are the science ones. Sun Tzu is nice but i often capture it and build barracks on the border cities.
-Civs: Some civs are better than others. It also depends on the size of map you're playing. My tips are for large maps and also standard. I always choose Egypt and second choice would be Iroquoius and then maybe Japan.
-The religious trait is amazing. Since expansion is must, you also need to gobble up the land where AI would build cities, and temples are cheaper. Industrious helps on such large maps.
-if you play an expansionist civ, two or three scouts can get you through the ancient age on a large map. No need for GL then.
-On getting wonders: Always set up your cities for those really good wonders. To get GL start capital on Pyramids, then switch. To get Leos start city on Sun Tzu's. I often have a city start to build a palace right before the end of the Ancient age. By the time Music theory comes around i can get Bachs immediately. I also start a palace for theory of evolution and any other later wonder.
The two keys are to expand quickly and then build a decent sized military to protect it. In the Ancient age just build spearmen, and maybe a few offensive units to open barbarian camps.
The best time to war IMO is maybe destroy a nearby civ with knights, and then wait for cavalry. In the Industrial age no matter what AI will war with you and each other. So as soon as you get Military Tradition build cavalry and then riflemen later. Cavalry can handle musketmen easily and riflemen with 2-3 cavalry. By this time you'll have some factories and size 12 pop. so cavalry can be built quickly. Even with infantry i still war with cavalry on offense. The key is to build tons of artillery and quite a lot infantry and cavalry. Then move artillery protected by infantry to basically destroy a city for cavalry to take over.
If i think of more stuff i'll post it.