Congratulations and welcome.
Here are some useful links
Manuals
https://www.keystonerv.com/owners-manuals
Keystone videos
https://www.keystonerv.com/owners-how-to
Also download the Lippert NOW app from Google play store. It has manuals, troubleshooting and TSBs.
Also in the files section you will find manuals for the water heater, furnace, fridge, etc.