Hi Frank,
It's so exciting you're planning on walking along the west coast of Ireland! I'd love to answer all of your questions. :) Will this be your first visit to the Emerald Isle?
1: I've had a look, and was able to find a GPX on the following page. (
https://www.activeme.ie/guides/wild-atlantic-way-scenic-drive-west-of-ireland/) Take a look at the Ireland.com page as well for more helpful
itineraries and information on
walking and hiking.
2: The official
Wild Atlantic Way page has some detailed and official maps as well, so feel free to reach to them too.
3: A great place for finding detailed walking routes in Ireland is the
Irish Trails page. Under 'categories' you can select 'Walking/Hiking' to search for the right trails.
I hope this was helpful, and please don't hesitate to ask any other questions here!