Hi ! Welcome to IRV2! We're sure glad you joined the gang!
I'm not familiar with your rig so can't help a lot. Are you connected to a .sewer dump? The gray tank will fill up quickly and will probably need to be dumped every 3 or 4 days if you are using the shower if the dump valve is closed. If you are hooked up to a dump you can leave the gray tank valve open.
The black tank valve should be kept closed until you are ready to dump. It's VERY important that you keep water in the black tank!
Good luck, happy trails, and God bless!
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD