When you first join the AOC RP you can attend a setup class with our teacher who will give you a starting balance of coin. The starting balance is 10 centaurian obols, 5 centaurian drachma and 1 centaurian chiron.
After that you could obtain centaurian coin in a number of ways:
There are some Obols laying around Centauria that were dropped by goblins.
You can now exchange xp for Obols - but take care with this - you need xp to progress up the levels - now you decide obols are more important - but just be aware that you'll lose xp by exchanging for obols.  The xp/obol exchange is in the Centauria Treasury/bank in the bottom of the member halls.
You might trade something you have in your pouch for centaurian coin with another user You might obtain the “selling scripts” from Unity and set up a market stall on market day to sell some of the things you’ve acquired or made.
You might apply for a “working role” which attracts a weekly stipend of coin from the sim.