Your bank statement will not be an issue, you automatically qualify for a K1 visa.
You fill out the requisite paperwork with the Australian Embassy in Saudi Arabia (even though you are a Pakistani citizen). The Australian Immigration website (in the related links below) can explain exactly which papers you need.
You can't just change the passport. She must go through immigration process. But If Pakistan gives her Pakistani nationality automatically based on marriage to a Pakistani citizen, then after she receives her citizenship certificate (or whatever other name it may have) then she can apply for a Pakistani passport.
Impossible
A US citizen can stay in Malaysia for up to 90 days without a visa.
by being a 'naturalised' citizen of Bahrain
Yes, a US citizen needs a visa to enter Malaysia for tourism or business purposes.
The best way to marry your American fiance is in America. This way, you can instantly become an American citizen. You can then work in Malaysia under a work permit. while retaining your U.S. citizenship.
just follow the Islamic rule because a good Muslim is good citizen.....
Yeah Ofcourse, why not.
at present ,pakistani citizens have no rights
According to the naturalization law, yes, your child is a US citizen because he's born on US soil, regardless of the reason you are in the US or your immigration status.
No unfortunately not