Please read before you breed.

http://www.geocities.com/learntobreed/
http://www.geocities.com/Petsburgh/Fair/1901/chart.html
http://www.pbrc.net/breeding2.html
http://www.akc.org/breederedu/responsible_breeding.cfm

I'm glad you're waiting before breeding, but there is a lot to learn before doing so. There is more to breeding than putting 2 dogs together and getting a litter of pups. There is a lot of time and money spending involved. If your dog is registered, join a breed club and get her into shows, conformation, agility, obediance, etc. and see if she meets all of the standards for her breed. While at these shows you will meet other Aussie breeders that will have dogs more qualified for breeding to your girl than the Aussie owner down the street or in the classified adds. The best of the best should only be bred and while she may be the best pet in your world, she may not be the best for reproducing (no offense, she may be a great representative of the breed). Breeding should only be done to improve the Aussie breed. For every pup you sell, an equal number of pups or adult dogs will die in a shelter because no one wanted them. I'm not anti-breeding, but there are too many homeless dogs/pups that need homes but won't get them as long as people are breeding without the education it takes to be a responsible breeder.