Growing Clivia from seed is very straight-forward.

If you have fresh seeds in a pod, remove the fleshy seeds from the pod and then clean each seed to remove the thin membrane surrounding it.

Plant the seeds on the surface of a sterile potting mix. Place in bright indirect light or under fluorescent plant lights. Keep the medium moist, not soggy. The seed should germinate in a few weeks. Clivia seedlings grow slowly and continuously, so once the first leaf is well developed, start to feed with a weak solution of soluble fertilizer at intervals.

Keep the plant growing until there are at least 12 mature leaves (2 to 4 years), when you can try to induce flowering by storing the plant dry and cool for 8 to 12 weeks in autumn. Keep the plant in the same bright indirect light, and at this point natural light is better than artificial: you want to reduce the period of daylight while forcing induction of a flower stalk.