Fishing licence

Hope you good people can help please. Providing restrictions are ever lifted,  we have friends from Austria, who will visit us in September. One of the group is a very keen fisherman and wants to fish in several places whilst he is here.

A few questions -

1.  Where can he obtain a licence ? What is the cost ? Can it be done on-line ? Is it issued the same day ?

2. Does one licence cover all of Spain, or will he have to obtain a licence in each Province ?

3. Will he need a seperate licence for fresh water fishing (a lake for example) and sea water fishing ?

Any advice or other relevant information gratefully received.

Thanks.