I strongly recommend that you walk up and down the old town to look at the various old buildings. You can get a folded leaflet at the tourist office at Hauptmarkt 33 with a map and the sights in German. I don't know whether they have the same in English.
What I noticed in various tourist offices around Thuringa is that you have to pay for brochures and/or leaflets. Best is to grab in previous towns the stuff for your next destination or ask for it at the big tourist office of Thuringa in Erfurt.