1. If FIR has been registered by Police against the accused including you and your family members, then all the accused shall have to apply for and avail Anticipatory Bail first since sec.498A of IPC is a non bailable section. Thereafter file an application before the High Court u/s482 of Cr.P.C. praying for quashing the FIR or the charges leveled against you in the said FIR for the grounds already detailed by you. Before filing the quash petition, you shall have to ensure that the police submits charge sheet before the Court in connection with the said case.There may be problem in getting the passport renewed if any criminal case is pending against the applicant. However, you have some time to act and get your name deleted from the charge sheet or get the charge against you quashed..
2. There certainly will be problem in all of your getting VISA since a criminal case is pending against you in India.
3. First of all apply for AB by getting the application sent to you by your lawyer in India and then get all of your signatures appended on the application notarised by the appropriate officer of the Indian Consulate in Australia for sending back to your Advocate in India for filing the same.
4. It is needless to apprise that your name has been added to harass you. So, act calmly and judiciously. First apply for and avail AB. Then arrange to get the charge sheet filed by the police through your relativves in India or through your lawyer in India. It may be that, the charge sheet will delete your name and in that case you shall require no further step to be taken as the Court will officially direct the police to delete your name from the FIR. If not, then you shall have to file the quash petition as explained above.
5. The purpose of the said complaint u/s498A adding your name was to scare and harass you and also to settle score with her husband which she has achieved reasonably well.
6. When the FIR is quashed or your names are deleted, then you can lodge a police complaint against her u/s211 of IPC for lodging false complaint against you for causing damage to you illegally.