Place seed in plastic bag ( or whatever makes sense to use ). Break up the seed lightly with a rolling pin as cilantro seed is actually a fruit containing 2 or more seeds. Rinse and soak overnight. Rinse again in the morning and plant in moist forgiving soil ( light airy, maybe some vermiculite in mix). Then cover with a humidity dome. A spray of water in the morning and evening. At 5 days there should be signs of germination. At 7 days you can remove the dome. Germination is sporadic at 9 days. 3 weeks or so to harvest.
It is a long term micro, so be ready to wait and always keep an eye on water, with long term crops too much water can be just as detrimental to crops and not enough water. Hope this helps or give you a place to start! It's a tricky micro definitely high on the difficulty level.