Lemme ask a few questions. For this boat, it's gonna be a Thetford or Dometic, or Camco, or similar porta-potti with pump out feature. Do you find a location near the head and locate a through fitting with "WASTE" that unscrews? Like a "GAS" fitting but it'll say waste and be a bit larger? If yes, then you do have a pump out system. The porta-potti is usually only good for two people for one or maybe two day/nights. But, on your boat, not going to be overnighting too much anyway, so day use. It'll support that. Most guys use the 'I pee freely' over the side, so that helps extend boating time.
As for pumping out, some folks in the same situation don't want to mess with the pump out, and they take the kit off(it's a separate valve and plumbing) and go back to manual removal and dump. The potti should have two separate halves that have a couple snaps allowing it to separate. you can leave the top part on the boat and just add some water and biocide, and remove the bottom part with waste to dump in your toilet. yuch.
Look again at the front or side of the lower unit, you might see a little round or square recess window. Inside the window will be a green background flag. That's the level indicator. it goes from green to yellow, to red when half and then full. Pump it, or manually drain it before it gets too far red.
They have a 2.5 gallon style and a 5 gallon style. I had a 26ft cuddy with the 5 gal and I hated taking 5 gal of waste off the boat, and trying to dump it in the marina toilet. It was a messy, smelly, disgusting job. So, I added the pump out kit, and was happy to pay $10 for a quick pump out at the gas/dump dock. But, that's me.
Last word of caution. If you get caught dumping black water waste over the side in closed waters, or just offshore it's a massive fine.