Hi Bailarina
And you should be excited! You'll probably get as far as Logrono at least, but it depends on your priorities, fitness etc. It's a lovely part of the Camino.
Brouse through this forum a bit more, because you'll find all kinds of advice. My suggestion would be to start with your flights. There are no major airports on the route, so you will have to consider buses and/or trains as well. (Look into Dublin-Biarritz then back to Dublin from Madrid or Bilbao, but you may find a better way.)
Once your flights are organised you'll have a clear idea of how much time you have to walk. Then you just have to decide how you want to fill that time; how far you want to walk, how long to stop in places of interest etc. Expect that to change as you start walking, meet people, and see places, so don't over-plan!
Buen Camino!