For the normal story versions that you do to progress the quests, you just queue for them. It will automatically find people for you from amongst the people in queue for Normal Raids roulette and the Mentor roulette, as well as anyone else who queues directly.

However, these came out 2 years ago so it can take a while, especially if it's not the evening hours for the region. Additionally, the Oceania data center is relatively new (did not used to exist), so the population may not be as big as other data centers and therefore it may be harder for it to match you with players.

You can try setting up recruitment yourself in Party Finder though and say it's your first time and you need help.

Now, the ones that you would likely see in Party Finder on a regular basis are not the normal versions. Those are, frankly, easy and you will almost certainly beat them on the first pull. The sort of raids that you would see in Party Finder are the (Savage) versions that you can unlock after beating the story versions. The latest of these are located in the High-End category.

Raids are released in sets of 4. So we had First to Fourth circles, then months later we got the Fifth to Eighth circles, then months later we got the Ninth to Twelfth circles. The savage versions of 9-12 are what are seen in Party Finder most regularly, in the High-End category.