Hi cult the big purpley one is a Cattleya of some description, the little one is a Phragmipedium.
For a beginner's orchid you can't go wrong with a Cattleya like that, they're generally pretty forgiving as long as you give them plenty of drainage.
You can start off by hunting down a local society's display, they always have plants for sale at a table. You can get info on society shows in the Australian Orchid Review, available in most newsagents, or from
Australian Orchid Council Inc. - Orchids Australia Magazine. Otherwise ring up a nursery and give them a visit. Some good orchid nurseries in Victoria are:
Australian Orchid Nursery - Home
mt beenak orchids - cool growing orchids, growing, flowers
The best orchid book for detailed information on as many species as possible is Flora's Orchids. You can usually pick it up in the bargain stand of a bookshop for $20 - $30. It's a must-have.
Growing Australian Orchids is a good one for Aussie natives. The best Encyclopaedic type is A Complete Guide to Native Orchids of Australia
Orchids for Everyone is a slightly older English book that you can also get in bargain bins, it has lots of detailed and interesting information, especially about looking after larger collections.
Easy Orchids is a good one for an easy, basic introduction, particularly focusing on indoor plants and small collections.