after the Tad Village do I have to do the Stout mines or Serpent Cave next?
a;where is the Stoutmine
b;how in hells name do i get into that infernal Serpent Temple?

Try looking for a back entrance to the Serpent Temple.

You should probably stay to the east of Ishad N'Ha for a while and finish up the temple before considering doing the castle and the mines which are to the west.

Wyv