well the LEDs in a UNIT (will define unit later) are wired in series and each unit is wired in parallel to each other.
a unit can have one or three leds. if one LED is used, wire a resistance of 470 ohms in series with it. this makes ur single "unit". if the unit is going to have three LEDs, wire em up in series and then add a resistor of 200 ohms in series with it.