Good advice above. "How To" on UTube is helpful. Search for answers to your question. There are many sites that provide a little or a lot of information.
Start with the Dutchmen website.
I have a 2018 Kodiak Cub. It came with a paper copy of a manual. For the most part it is an extremely general manual and could cover many Dutchmen TT's. You may find one that is more specific to your 5th wheel camper.
Things to look for in the manual are things like “How to winterize your plumbing system” and other general maintenance requirements. Temperatures below 32 deg. F will cause pumps, valves and pipes to break.
Batteries need maintenance. Helpful instruction in the manual may say “batteries must be maintained”. There may or may not be more detail. Searching for the answer to “How to maintain travel trailer batteries” will probably be much more helpful.
Given the time of year, you may wish to start with ‘How to winterize a travel trailer”. Next, move-on to other subjects.
Feel free to post specific questions on iRV2. There will likely be multiple experts who will address your question. You can also search or post questions on iRV2.com.
I wish you good luck and happy trails ahead!