Hi
We have started three business in WA in the ten years we have lived here, I think it is much the same as anywhere in the world you have to look at the area you plan to start in & check out if your service is needed. There are quite a lot of good sites to help you with the legalities such as registering your name etc.
You do not say what you plan to do so it is difficult to say if local people would use your service but we have never had a problem & I think so long as you offer good service at a fair price you will always have customers.
When we first arrived we found it difficult to find suppliers & the people we did find were not always very helpful, as time went on we found we had to re-negoitate pricing, delivery etc. However things in WA have changed a lot in ten years & it seems easier to find information on things.
We had moved from our home town where we were well known for good service & didnt have any problem even from the outset running the business because my husband was well known & people he knew used him. Obviously that is not the case when you come to a place where you know no one. We did a lot of advertising, arranged leaflet drops with local papers & tried to do as much as we could to let people know where we were & what we did. The local papers here often do business profiles where if you pay for a reasonable size advert they will write a free profile on the business. The local papers here are delivered free to each house in the area & this was an excellent way of telling people we were here.
Unfortunately we are still unpaid tax collectors here in Australia the GST works in a similar way to VAT & you would usually do a quarterly return. The GST is levied to most services & is currently 10%
Here are a few sites which give general information if you tell me specifically what you intend to do I will try to find information on that industry for you.
Small Business Development Corporation
The State Library of Western Australia
business.gov.au home page
Chamber of Commerce and Industry Western Australia-CCI Western Australia
Australian Taxation Office Homepage
Good luck with the venture
Eve