Welcome to the forum! It is unfortunate, but typical for RV manufacturers to deliver a manual that is generic, at best. Thor is no different in this. You should have received manuals for many of the components, or as suggested you can find those online from Atwood, Onan (Cummins), etc.
The crowd sourced manual that Ed Felker put together for the Vegas/Axis may have some useful info for you, even though that is not your unit. Find it on a sticky on this site.
Your new friends here on this forum are very knowledgeable and helpful on almost anything that might come up for you.
There are friends, there are family, and then there are friends that become family!