Welcome to the site and full-timing! As Dan said, members are able to help with lots of problems. We all have a few whether our rigs are brand new or older, so don't be upset when they arise. Another good site for info, simply because it's so large, is rv.net. There are others, but I was, and still am compared to many, a newbie and have needed lots of advice. I've found these two sites the most helpful.
You do want to get any water leak problems fixed asap, as they soon lead to expensive damage if uncorrected.
You might get by with fitting pipe insulation around your city water hose. I would avoid a long run of hose that is curled up. Get the shortest piece that will fit. Many parks here have heat tape wrapped around the pipe up to the spigot. I don't know if running it around your hose would be safe, but others will be able to answer you on that question. Some just fill their fresh water tank and don't keep the hose out, but it may not get cold enough there to make that necessary.
Good luck, and enjoy the extra hours in the day. :hihi: