Some general tips: build faster by building the first cities closer together and having an early granary. Most early wonders are not worth it, the exception is the Great Library.
Some openings for Monarch and Emperor level:
1) Swordsmen Conquest - Build 3 to 6 cities, depending on map size and enemies. Research Bronze and Iron Working, then turn down research to save gold. Build barracks, bunches of warriors. Hook up iron and upgrade warriors. Attack nearest enemy with 10+ swordsmen. Best on standard size maps. Try to attack around 600 B. C. on Monarch level and a bit earlier on Emperor. If no iron use archers or build more cities and wait for horsemen.
2) Combined Arms Conquest - build 8 to 15 cities. Build an attack force of 20+ units, mixed horsemen and swordsmen. Catapults help, especially against hoplites and legionaires. If the player is a bit behind, it is a good idea to turn down research to get gold to pay for allies.
3) Knight Blitz - build 10 to 20 cities. Good for large and huge maps with a lot of room to expand. Build 20+ Horsemen, get Chivalry as cheaply as possible. Attack with 20+ Knights. This may take some practice to get the tech, the units and the gold all lined up by around 600 A. D.
- Bill