Tourist Visa (Visitor Subclass 676, Form 48R)

My friend is going to apply Visitor Visa for Australia and asked me to check the required information on this forum before submission.

1. What are the maintenance funds required for 12 months visitor visa (Subclass 676)?

2. How much money should be shown in his bank statement?

3. What details he mention about "evidence of incentives to return home country?

4. Does medical required for 12 months visitor visa (medical tests) and which medical form required to fill up.

Thanks for answering the above questions.

Kindest Regards