You will need a fresh water hose for city water connection. It would be a good idea to get a water filter as well, if you camper doesn't have one built in. Our last two campers had inline filters inside the camper. Our Motorhome only filtered the cold line on the kitchen faucet, so we added a filter to the fresh water hose.
Our last two campers came with a sewer hose with a fitting on only one end. We do have a rubber donut for the ground port, but I don't really like to use it unless I have no other option. It was a cheap sewer hose and we didn't use them. I really like the RhinoFlex system. On our last camper, 15' of hose was sufficient so we just bought the 15' complete kit from Walmart for less than $30. You can also piece it together to get exactly what you need.
I would follow K3WE's advise and spend a night in the driveway or backyard if possible, then camp near a Walmart or at campground with camping supplies. Every Walmart stocks different camping/RV supplies. Some have more than others, but most carry the basics.
-Michael