Capital gains tax and other tax’s payable when we sell the property

Hi everyone,  Have a few questions on capital gains tax and other tax’s payable when we sell the properties..

We have block of land in Melbourne, with old house on it, we bought the property in 2004, since then between 2005-2011 had been a rental property, last year we made plans to build 3 townhouses on this property. At this time we have submitted plans into council.

We have already organised a good builder, all the cost to build have been calculated, money for build is coming from overseas, loan from a 3 party.

I have some questions on the property capital gains tax and other tax’s payable ? once we sell the townhouses.

1. What are types of taxes we would be need to pay after the units are sold?

2. Is the any way we can avoid paying the capital gains or other taxes even we keep property, live in it? Or rent it?

thanks any help would be great! Charles