I found this.
Propagating Clivias
Clivias are generally propagated by dividing established clumps, but they can also be grown from seed. When the round, berry-like fruit is soft and well-coloured, remove the outer fleshy coating and sow the round seeds into pots of Seed Raising Mix. Although they do not take very long to germinate, you will need patience if you are growing them from seed.
Planting seeds can be quite rewarding and occasionally yield a surprise in a variation. Most important, the seeds must not be buried, but rather slightly depressed into the growing medium with about half of it open so it can photosynthesize. When the first root develops, sometimes you may have to help bury it into the soil. The first year of growth will develop 2-4 leaves and the second year 4-8 leaves. Generally flowers appear within the fourth year.
Also the September 2006 GA mag has detailed planting instructions. A library should have it.