What are the train and bus apps/services that I can check to see if my interrail trains match?

These are the routes I’d like to do:

• Arlanda airport/Arlanda central station to Soderhamn. 
• Soderhamn - Uppsala - Soderhamn
• Soderhamn - Gothenburg - Soderhamn
• Soderhamn - Copenhagen - Soderhamn

I’ve had a look online and Google maps but want a rough idea of pieces (preferably the cheapest option)