I just got the American Horticutural Society encyclopedia of plant propagation says here that Amarylis seed heads will dry and start to split.
-Ripe seed will be black in color.
-Sow the seeds in well draining peat/perlite mix in at least 60*F soil temp
(I place my jiffy seed tray/greenhouses ontop the terrarium lights to warm the soil and hasten germination of my seed crops)
-pot up plants individually once their leaves are 5-6" long
-Initiate dormancies for new plants by watering less.
Note: Amarylis roots do not die over their dormancy like most bulbs (like cypripedium orchid roots which remain succulent even in winter) so they need to be kept slightly moist as they rest. If you have a Bachmans plant/floral shop in your state they have a great little book on Amarylis which has recently been marked down to $10.00 from $24.95 (at all the MN Bachmanns anyway).
Did you do a cross of two different plants or a selfing?
My favorite Amarylis is the Red/White clown stripe
I would imagine 4-6 seasons from seed to blooming size bulb. There's not much actual hard cash to be made from raising plants of ANY kind (ok, Dope would make you bundles of cash but also put you in a heap of trouble!
If you actually break down the cost of specialty soil mixes, lighting, pots, water, humidification, heating,cooling, plant tags, waterproof markers, blah, blah blah. You're not making much unless you've gt a huge turnoever business selling annual plants by the semi truckload. It has to be done as a love of the process of raising and selling plants that are inspirational to the grower.
When my pal sells a slipper orchid for $200, a lot of money to many of us, it may have been at the shop for 6 or more years (especially if it's one he grew from seed in his TC lab) that plant racked up much more in "rent" and "labor" than he actually gained in profit. The cost of rasing plants is the same for hobbyist growers who use their meager plant sales money for supplying the same necessities to there collections and accuiring new species to sell or trade.
Don't look for $ in plants, work with those plants who move you. Of course, get what you can for them as there's lots of work involved. Study the markets and see what people are selling things for.