Zagreb to Ljubljana; Ljubljana to Munich

[joshww]

Does anyone know if it were ok to book a train travelling from Zagreb to Ljubljana, as well as from Ljubljana to Munich, while in the respective cities? (Actually it seems more like of having no choice as the websites don't seem to have the costs of the rides.)

Also, should I book this as two separate train rides or a single trip, with a stopover for a few days at Ljublana?

Thanks for your help!