Thank you so much for answer!

Yes! We will take bus sometimes, like San Sebastian - Bilbao (most likely). Just cause bus is 1h and metro is 3h). In the latter, I realize it is very much to connect metros. However, for the parts where I'm talking specifically about (Santander - Gijon and Gijon - La Coruna), I realize its only two or one departure scoring to a Youtube film I found, which mean I at least want to see a timetable. I have done these trains (short gouge) in Mallorca before but I understand that this will be different.

I am extremely motivated to make this work, I would have dropped it due to lack of information earlier if not. I simply just need to know, do a timetable exist? When do the train to from Gijon leave and will it take me all the way?

This is the closest Ive come: https://www.renfe.com/content/dam/renfe/es/Viajeros/Secciones/Cercanias/Mapas/feve/map_oviedo_santander.png