Welcome to the forum!
The best thing for you to do is get acquainted with all the systems and appliances in the trailer, electrical, plumbing, A/C, heating, lift system, brakes, tires, etc. If you have the manuals for the trailer and the appliances read through them. If you don't have any manuals go to the forum reference library and look for the listings of manuals. There is a video manual that would be very helpful but not all that complete. The most important things are the maintenance of the lift system, the brakes, axle bearings, and tires.
Also, get on the forum and ask questions. There will be lots of help from our many members.
Enjoy your "new" Hi-Lo!