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I don't know how much fluid you'll need. However, it's generally recommended that you flush the entire system when converting from reg oil to synthetic. The reason is because a large amt of fluid is trapped in the differential as well as the torque converter which doesn't come out with a typical empty and refill job.
As for the filter, it's not a disposable type. It is reusable. So have it cleaned and reinstalled. The gasket should definatly be replaced. They aren't expensive.
Lastly, on a car that age, you might consider just changing the fluid more often instead of going synthetic for economic reasons. Just something to consider.
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