Welcome to the Forum from Western New York State! Congratulations on the new Jayco!
You'll find varying opinions on the tanks, and what to do. Since you'll be on FHU sites, you have the option to dump the black and gray tanks when you get ready to leave for the next one, or wait until you get there, depending on how full they are.
You haven't mentioned how big or small your family is, and that can be the deciding factor. Keep an eye on your tank levels, use plenty of water to flush the toilet. Too little and the dreaded poop pyramid will form. If the black tank gets to 2/3 full or more, go ahead and dump it, run the black tank flush if you have it, followed by the gray tank. You'll find (most likely) the gray will fill up faster than the black. At this point, I give a plug to buy a tank flushing wand, even if you have the built in tank flush fitting. Our TT's 9 years old, and the sensors still work, since we flush the black tank with the wand at the end of every trip. Traveling to another campground will agitate the tanks if they're not full enough to dump at the previous site, then you have the option to dump them there when it's time.
Now the fresh water. I think it has two tanks with an equalizing hose between them. That's the way ours is. But there's a water spigot to hook up to on FHU sites, so filling the tanks full isn't necessary. You can always keep 10 or 15 gallons in them for a roadside pit stop, but just connect your fresh water hose and filter to the site spigot, and you'll have much better pressure.
Feel free to ask anything else that comes to mind. We're here to help out.
Every day's a learning experience, though sometimes not what we expected.
2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
1 Spoiled Dog (RIP Bartley)