There are many sources of information on the internet.
There are also the various societies, including the African Violet Association of Australia, membership of which makes it possible to access the personal experience of many other members.
Specialist nurseries which deal in these plants are other likely places to find the answers to your queries and, of course to purchase wonderful plants.
If you wish you can query the Association directly with your questions on the above link.
THE HUNTER VALLEY AFRICAN VIOLET SOCIETY
Meets at Cardiff Senior Citizens Centre, corner of Myall Rd and Harrison St. Cardiff, on the 4th Sunday of the months January to November.
P.O. Box 109, Cardiff NSW 2285
Website: http://www.africanviolets.org.au, email address email@example.com.
AFRICAN VIOLET AND GESNERIAD GROUP OF THE HORTICULTURAL SOCIETY OF CANBERRA
Email contact: firstname.lastname@example.org
EARLY MORN AFRICAN VIOLET GROUP
Meets twice a month at Alvie Hall, corner Alvie and High Street Roads, Mount Waverley.
P.O. Box 186 Mt. Waverley, VIC. 3149
AFRICAN VIOLET SOCIETY OF QUEENSLAND
Meets monthly January to November at the Auditorium Mt Coot-tha Botanic Gardens, Toowong, Brisbane.
AFRICAN VIOLET SOCIETY OF SOUTH AUSTRALIA
Meets monthly except December at the Western Youth Centre, 79 Marion Road, Cowandilla, SA.
AFRICAN VIOLET SOCIETY OF WESTERN AUSTRALIA
Meets monthly on the third Saturday of the months February to November, at Senior Citizens Centre, Downey St, Manning, Perth.
The African Violet Society of America: An excellent website, every corner of which should be explored, at: http://www.avsa.org
African Violet Society of Canada: http://www.avsc.ca/
Rob's Violet Barn. This site has photographs and information for growing; it is not just for sale of plants: http://www.robsviolet.com/
Holtkamp Greeenhouses (Optimara). Many photographs and general information, expecially about the Optimara African violets. http://www.optimara.com/