Hi rdrcr150,
Welcome to the family of Phoenix Cruiser owners!
We bought our PC-2350 new in 2007. The so-called "owners manual" was not detailed enough to be of any use to me. Given our purchase back then was our first self contained RV with all the on-board systems and appliances, I felt very uncomfortable until after taking our first weekend get-away. It is remarkable how quickly you learn when you have to.
The only things to worry about that could do any kind of damage (or death) are common sense things. For example......
1) If you smell propane gas, first open the windows and door and then determine why.
2) The same goes for other fumes like from the furnace for example. I nearly asphyxiated us turning on our furnace the first time.
3) When living inside it during-operation, you need the rig fairly level. You don't have to be anal about how perfect. If the rig is being lived-in with it terribly crooked, you could mess up the operation of the fridge and slide out. Leaning toward the opposite side of the slide out could allow water to get into from that area, especially during a wind-driven rain storm with the rain hitting the rig just right.
4) You want to pay close attention to your house battery voltage. When fully charged, a volt meter like the one pictured below, will read 12.7v with nothing turned on. You'll want to charge it back up when it reads below 12.3v with nothing turned on.

5) The operations panel above your stove top integrated into the vented hood, when working right is very misleading. Do NOT trust it at all, especially for monitoring battery health. The cheap plug-in volt meter is so much better. Plug it into the 12v outlet in your PC. I assume you have one in the PC house somewhere.
6) I strongly advise NOT to learn everything over the winter where your pipes could freeze.
Everything else you will learn as you go.