1. Red Barn Furniture - Located near the Revolution building
2. Save them for a head upload, or for an event. Don't waste mney on furniture unless you plan to fully decorate it, as selling furniture only merits 50% of original purchase price.
3.Sparring can be both. In season its mainly singles, and end of season tournaments are held between guilds called the GST for short.
4. Don't really understand your final point.
Hope I helped somewhat!