Natural rainfall will do the job. You'll attract heaps of wildlife and birds. You'll help in the survival of many endangered birds and other native animals, including the regent honeyeater. By attracting native birds and other predators, you will have less fruit-fly, less mosquitos, less grubs. This in turn means you will use less, very expenisve, chemical control.
Members receive information magazines throughout the year and can participate in field trips.
Obtain healthy plants to start with. You will also have a much greater success rate if you buy plants that have been propogated in your area. Nurseries local to the Central West are listed below. You are also probably better off buying tubestock than advanced plants. Buying advanced trees increases the risk of them falling over in the first strong wind.