You can find a list of services and prices here: https://siluteinfo.lt/apie-mus/paslaugos/
Information about guides is available at: https://siluteinfo.lt/laisvalaikis/gidai/
Information about ferries, routes, prices, and seasonal schedules is available at: https://siluteinfo.lt/susisiekimas/keltai/
Yes. The train runs daily on the Klaipėda–Šilutė–Klaipėda route. Schedule: https://siluteinfo.lt/susisiekimas/traukiniai/