You can grow bonsai trees from seed like other plants, however most
tree seeds need stratification prior to planting. This is accomplished
by keeping the seeds in a cold environment for a period of time.

Humidity Tray (Extra Extra Large) - 10 1/2" x 14 1/2"

$23.95 - A finishing, practical addition to your bonsai living sculpture.
Not only do they visually enhance the placement of your tree, but
humidity trays make watering simple, provide essential humidity for
your tree and protect furniture from stain and damage. - 10 1/2" x
14 1/2", black heavy duty plastic with raised feet.
One of the few things agreed upon by Bonsai experts is that your
tree should simulate age. Although your tree may be only 12 to 18
years old it is one of the aims of Bonsai to make it look as if it
has been growing for decades. The training of Bonsai into different
styles is a subject much discussed, from root over rock, to group
planting, cascade and large single upright specimens.

Desktop Grow Light 
$39.95 - This incredible computer - operated, 9 - watt, full spectrum
flourescent lamp is the answer to all of your indoor gardening needs.
An automatic computerized timer turns the lamp on and off, simulating
the day length in cycle with the four seasons. The soil moisture sensor
eliminates the guesswork about watering. To vary the light intensity
or accomodate larger plants, the telescoping stem adjusts from 7"
to 14" high. The textured pebbled base serves as both a catch basin
and humidity tray. A wonderful gift to keep bonsai thriving whether
at home, office, hospital or classroom. - Instructions included. -
Grow lamp bulb also included. - Shipped UPS 2 - 3 days - $9.95
Here are some other sources of Bonsai information:
BonsaiBasics.com
- Series of questions and answers on everything a beginner needs to
know about keeping their own bonsai tree healthy and beautiful.
Bonsai
Information - This site covers many aspects of the art of growing
and training a bonsai tree.
Fork
& Spade Magazine - Bonsai for Beginners!
Amazon.com:
buying info: Indoor Bonsai for Beginners
A Beginners
Bonsai - Jeremy Hill's gallery of bonsai in training, with a neat
collection of links to other sites of interest.
Bonsai
For Beginners - by Craig Coussins - Bonsai Trees