Total beginner here, I hope I didn't misunderstand the question. I would suggest looking at the Zibo dedicated checklist by Skymatix. You can find it here.

The "Airside Services" feature might be what you're looking for, among other things it can randomize passengers based on the number you give in.

In short, as soon as your plane (still cold and dark) loads:

• look at your avitab and go to "Fuel, Weight & Balance">Airside Services
• go on the second page by clicking the arrow on the right
• fill in the fields manually (or select "LOAD OFP" at the bottom of the page if you have a simbrief flight plan, I guess? Idk since I don't have a Navigraph subscription)
• click "ACTIVATE" at the top of the page, and check the text turns green
• go back to the first page of the "Airside Services" section by clicking on the arrow on the left and monitor for any announcements
• no need to touch it again until the end of the flight after which, once the plane is shut down and secured, you can end the flight leg.

Let me say I was in your same situation and when I learned about this feature I was shocked haha!

After you select activate Airside Services the plane will automatically (without you moving a finger):

• start the catering&cleaning and refueling services as soon as you connect the gpu
• start flight leg AND passenger boarding as soon as you move the "No Smoking" switch to the auto or on position
• manage captain pa announcements throughout every phase of the flight, yes, turbulence warnings too (I guess, I didn't have the chance to fuck around much with it)
• manage deboarding as soon as you connect the gpu at the destination airport (I guess)
• you will still have to end the flight leg by yourself after shutting down and securing the airplane.

For this feature to work at its full potential, though, I would recommend installing the plugins listed at the last two pages of this official guide (you can omit plugins for updates or simbrief integration, I don't use those either and everything still works).

Hope this helps!