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I am not a big fan of fishing, its quiet boring. I would suggest a fish farm, then you only need to spend minimal amount of time holding on to the rod.
Afterall the main purpose is to catch one for your mum right.
If you are into recreational fishing, then it depends on what type of fish. My grandpa used to take me to Port Macquaire lake systems. And you can catch nice flatheads there, along with small ?brimes (spelling) which often or not you need to throw back. For bait you can buy them at the tackle shops, or you can use a suction ... thing... to get pippies (spelling). But if you as impatient as I am, just put a BBQ or KFC chicken carcass into a crab net, and see what happens after 1 hour.
You can also go deep sea fishing charters. The one time I did, I think I fed the fish more than the fish fed me... But, nevertheless, its easy with a charter, because they have these radars, and its really easy. And they also gut and clean up the fish for you in the end if they feel sorry for you.