Congrats on your new camper. We too are newbies and have purchased a 27DSRL. We are happy so far with the camper. The only issues I had right off the bat are the shower in the 2015 models don't have a shut-off on the shower head. This will cause you to use a lot of water taking showers and quickly fill up your gray tank. I purchased a Camco 43712 shower head on Amazon but haven't had time to install yet. The other issue is the bathroom faucet is too small unless all you want to wash is your fingrtips. I think any hardware store faucet replacement will do.
2015 Jayco 27DSRL (Sold and shopping for new 5er)
2016 Little Guy CIRRUS 800 Truck Camper
2015 GMC SLT 3500 Duramax Crew Cab, SRW