Welcome to the forum Jimbo.
Where are you coming from? I ask, because if you are coming from NA (or Oz), I suggest spending a day or two in Paris A) Because its really nice and, B) you will have a day to recover from jetlag. If you have the time, spend a couple days in Paris, and take the train to Bayonne from Montparnasse station when ready. You connect to a local train in Bayonne to SJPP. If you are in a hurry, you can take the train to Bayonne or fly to Biarritz from CDG as soon as you arrive. Either one will work fine, depending upon when you get in and what connections are available. Not too many flights from CDG to BIQ, most are out of Orly, Paris' other airport. From Biarritz, you can book a shared ride at expressbourricot.com or take the city bus to Bayonne station and take the train. Me, I like the train, but others get a great deal on the flight, and use that.
Buen Camino!