There are a few available, all seem good to me, however, the book by Backhouse & Jeanes - "Orchids of Victoria" has maps which give you an idea where to look.  This aspect is a must in my view.  Other books give vague directions such as "Victoria" & "Moist Well drained soils" - these descriptions are of little use to a new comer. All books have pictures which help in identification.

I like a digital camera best.  I can shot till my hearts content and not pay for dud photos I may take, and I can assure you you will take duds!  The small size of most orchid flowers, coupled with the wind, no matter how faint really gets the orchid moving, making a sharp shot tricky at times.

Most digitals have reasonable Macro modes, however some are better than others.  Look for a unit with a minimum of 2cm for wideangle and say 10-15cm for telephoto (150-200mm 35mm eqv.).  An anti-shake system is also useful.  The zoom range allows you to take photos with varying perspectives.

The more Mega pixels you can afford the better the resulting pictures will be no matter what camera you get.  Mega pixels allow you to get in close when the optical zoom won't go further.  Don't however think about digital zoom as a feature, its hopeless for sharp shots.

Remember a small Tripod is also useful, try a timed shot to reduce camera shake.

Go for a walk, look down, remembering where the orchid likes to grow.  Look for leaves, these are future flowers.

Hopefully you will spot one on your walk.

Remember to talk to other walkers, there's lots of other Orchid hunters out there and they will usually help in locating orchids.

I rarely leave the made paths, as 99% of my orchids have been found next to the track (say 0-2m).  This makes walking easy and Mr. Ranger from Parks Victoria will be happy as well.

The final word is always check out 50m around your car, especially if your parked on the start of a bush track, its amazing how many orchids you can locate, having missed them on your walk/search.

Orchids are not a Spring thing! they may be more out then but they do flower all year, recent rain seems to help flowers bloom.

Look at other photo opportunities, Fungi, Birds, Flowers (tress/shrubs etc) General views - even family.

So many orchid flowers "pop -out" at you when you stop and look.