Hello stpete, nedderlander and chesl73. Welcome to the site!
Don't forget to download the BIABacus software. Excel based file that is a big help with configuring and conducting BIAB brews...
Stpete - look through the site. You can see lots of others that have went through the same things you will be, and have posted and got some excellent advice. I might be case in point... I've posted lots of questions and have been given lots of excellent advice! Nothing has been perfect, but just the same all my BIAB brews turned out (final result) very good! I'm very happy with them and expect you to be as well.
Nedderlander - I have never used Brewsmith software but there are some people that use this site that could likely help you convert. Most will likely encourage you to use the BIABacus, for assorted reasons, but they would likely feel BIABacus to be more accurate and more tailored for BIAB. But either way, it makes beer...

And beer is good and is our friend.

I believe the 6 gallon brew pot to be a little small for brewing a 5-gallon batch unless you do things like withholding water and adding later, etc. Best to have a larger pot and be able to do a full volume mash. I would think, living in China, hardware such as a bigger brew pot might be really low cost...

I was vacillating between a 10 gallon and 15 pot. Almost went with smaller 10 gal (it would have worked for most of the 5 gal brews I brew) but ended up going 15 gallon. Very glad I did! Ran out of beer (a beer emergency

) a month or so ago and was able to almost do two 5-gallon batches at once. Enough beer produced for two 4.55 gallon batches into two fermenters...just over 9 gallons in total. Beer that finished at 5.25% ABV. Anyhow, a bigger brew pot gives you more flexibility.
Chesl73 - the pioneers of BIAB are all from your native land of Australia and have had such a big, positive impact on many of the rest of us around the world, in our brewing hobby...! It almost seems incredulous that BIAB isn't being practiced by everyone in Australia. Here in the USA, more doing BIAB all the time but it definitely is still the minority. Well, other styles of brewing can produce good beer too, just not as easy and takes more equipment. Glad you found the site. There are a lot of helpful people here that can help if anyone has questions.
Best of luck guys...!
Scott