If you just bought a new RV the cheap flimsy sewer hose that comes with it will NOT be long enough to reach a sewer connection.
do yourself a favor and buy a new hose first thing!
This one sold at most Walmart stores will be the best thing you will have ever bought for your RV. It also comes with the attachments that are often required at most CG's. If you don't have these attachments they will ask you to buy one at their camping store$$.
the longer you RV the more you will realize just how great this sewer hose is compared to what we call the stinky slinky cheap ones you will see your fellow campers struggling with! :W
Rhino Sewer Hose Kit
Sidewinder

Welcome to the forum and happy camping! :C