We've always been able to shove the luggage under the beds, no problem and yes, the closets come with hangers, so you don't need to lug those with you.
As for the non-alcohol drinks, like cokes, yes they do charge for those as well as any alcohol drinks. You can usually find coffee, tea, juice that is comp. It does help to bring some soft drinks on board with you, if you have the space and can pick it up close to the pier. You sure picked a nice ship for a first cruise, enjoy it and take plenty of film for all those great pics. ITs also nice hearing that you enjoy the boards here, looking forward to how you liked your cruise :-)