Welcome to the forums and congrats on the new coach. Lots of good free info on here.
While we may be overly concerned about tire pressures and weighing I would not recommend going to the max (usually 120) and forgetting it.
Checking the DOT date code on the side of the tire (sometime only one side) is very important. The last four numbers will tell you the week and year the tires were made. If you have something like 3204 at the end of the DOT number... you need new tires as they are 10 years old. Most on here replace their tires before they are seven years old.
You may have some pressures listed besides the driver's seat and I would use them for now. With a good tire gauge I'd start by seeing what pressures you have. If all four on the rear are almost the same at probably 95-100 that is good enough until you get it loaded up to weigh. If the fronts are around 110 that should be enough. If the pressures are all over the place and much lower than the above and the tires are only five years old I'd put new on. For the money I'd suggest Hankook tires.
There is a lot of info hidden in the search box at the top of the page.