If you want to play the culture game, keep one important thing in mind:
More cities = higher culture cost EXCEPT for puppets.
That means you will want to play a tall empire. OCC is completely viable and I actually like it more than 4 city tradition, so I will briefly show my OCC strategy (for difficulties up to emperor) here:
(0) Map choise and starting location:
With OCC, you want as many tiles as possible to place your great persons, so water-heavy maps like archipelago aren't a great idea. One of my favorite picks is Great Plains, because if you start in the middle you have plains, rivers and TONS of bonus ressources like wheat or cows - perfect for OCC. If you haven't any experience with OCC I recommend to re-roll if you get tundra or small coastline starts. It is also necessary to have at least one production tile within reach, so if up in flat grassland you will have a rough early game. Doable, but painful.
(1) Some good OCC civs I usually use are:
Aztecs: +15% food from floating gardens will speed up growth significantly. This UB alone makes them a great CIV for OCC.
Egypt: Their wonder bonus is quite neat, desert bias is great thanks to Petra.
Inca: Terrace Farms are very good to get extra food. Hill bias guarantees good production, defence and a good chance for a mountain tile near your starting area. Ignored hill movement cost will further improve defence and speed up your workers, slingers are actually decent units against early AI rushes. Overall a very versatile CIV that can adapt to almost any enviroment (except maybe flat open tundra).
Korea: Their UA is great if you rush the Great Library, and +2 science from GP improvements and specialists will guarantee that you stay competetive in regards to science during the whole game (unlike other civs, that will usually start to lag behind from the industrial era onwards in OCC).
Netherlands: The Polder is an insanely powerful improvement, but VERY situational. If you manage to roll a desert start with the Netherlands (try "Sandstorm" map type), you have the perfect OCC starting spot.
(2) Tech order: Pottery -> Writing -> Calendar + Mining (order depends on luxuries and amount of forests) -> Mathematics -> Currency (ONLY with a desert start for Petra) -> Theology -> Education -> Acoustics -> Chivalry -> Metal Casting -> Machinery -> Architecture -> Scientific Theory -> Industrialization -> Archaology -> Electricity -> Radiot -> Biology -> Replaceable Parts -> Plastics -> Ecology or Nuclear Fission (depending if you have a desert location) -> Satellites
Early war will force you to research Masonry to build/buy walls and jungle may force you to get bronze working early on. Be adaptive.
(3) SP order: Tradition opener -> Aristocracy -> Legalism -> Monarchy + Landed Elite (depending how much food is available) -> Oligarchy -> Piety opener -> Organized Religion -> Reformation -> Mandate of Heaven -> Religious Tolerance -> Theocracy -> Freedom opener -> Constitution -> Civil Society -> Free Speech -> Democracy -> Universal Suffrage -> Two SP trees depending on your situation (commerce opener + patronage if many good city states are around, honor if you have eternal wars against the AI). It can also be a good idea to open commerce if you finish piety before you enter the industrial era.
(4) Build order: Monument -> Shrine -> Great Library -> Hanging Gardens -> Petra -> National College -> Oracle -> Hagia Sophia. In general the build order will change a lot of times depending on the amount of

you have. Grabbing the Hanging Gardens is very important. Other great wonders are the Oracle, the Hagia Sophia, Chizen Itza, Alhambra, Leaning Tower of Pisa, Louvre.
Use your warrior to steal a worker or two from city states around you. Connect all luxuries asap and sell them for 240 a piece, then connect strategic ressources and sell them for 45 a piece. Use the money to buy the buildings (granary, water mill, market). Buy all poduction buildings asap (workshop, windmill, factory).
(5) Religion setup:
Panthon: +10% growth OR whatever fits your starting location.
Founder: +1 gold/4 followers
Follower 1: +2 faith for each wonder
Follower 2: +8 culture from eremitage
Enhancer: -25% prophet faith cost, +25% prophet power
Other valuable follower beliefs: Cathedrals, Feed the World, Religious Community
(6) Use all artist slots ASAP. Settle all artists you get, use 2 prophets to found and enhance your religion, settle the rest, settle any scientists you might receive. Use engineers to rush important wonders. Use merchants to trade with city states.
Once you have finished Freedom, burn all artists for golden ages. Try to time the Louvre so you can use these two artists, too. With some planning, you should be able to finish the game around turn 280-320 with dozens of rounds of golden ages left.
(7) In case of war build walls and castles ASAP. Get ranged units to wear down the attacker. If pressure gets too heavy, drop a citadel with a great general next to your city. If that isn't enough, place two additional once next tot the city to create a death zone. Don't be afraid to negotiate peace if necessary. With OCC, the AI will usually only demand all the money you have. Just spend it on buildings and city states, and sign peace with Attila for the remaining 25 gold.
