Welcome to the SBO forum. You've joined some of the best sailors to ever press fingers to computer keys.
This the boat you bought?
She looks comfortable, but she needs a replacement mast, maybe two? 'Cause, with that deck house, she looks like she may be a ketch or yawl rig to balance her helm.
What I've learned about the regs around human waste is, there are local and/or state codes to be followed. In general, dumping of human waste is not allowed within 3 miles of shore unless it goes directly from tushy to ocean, no container, such as a toilet or holding tank, in between. Therefore, a direct flush head is unusable near shore.
Do a search on posts by Peggy Hall Headmistress, she is the guru of dodo, the sensation of sanitation, the Royal of flush.
Your new boat is a beauty and a little odd for these waters, but welcome to our forum, you'll find answers to most of your questions. These guys know stuff.
-Will (Dragonfly)