How long are you staying for, and what port are you arriving at? I ask because the WAW is massive, going from North Donegal to East Cork.
You seem to be interested in Donegal and Galway (Connemara) so you have a treat on your hands! Try not to be too ambitious as it is a huge drive and if you rush it, you won't enjoy it much TBH.
So you can arrive at Rosslare, Dublin or Larne (Northern Ireland), but the arrival port will depend on where you are driving from in UK I suppose!.
Anyway, let's say you start in Donegal, the following are not to be missed - (You can reverse the route depending on where you arrive in Ireland).
Slieve League cliffs
All the coastal route from Port Salon down to Donegal Town. Go to Glenveagh National Park if you can make it. Just pootle along the rest of it, as overplanning can spoil things you might just find when out and about.
Then from Bundoran to Sligo. I think you will be amazed at the mountain scenery especially Ben Bulben in Sligo. If you can get to Glencar Waterfall, all the better. Strandhill is a lovely beachside village, full of surfers and great food/cafes. Rosses Point and Mullaghmore great too.
And on to North Mayo. Really wild there, and around the coast is gorgeous. Don't miss Achill Island which is reachable by causeway, and Westport Town. Plenty more, but I'd be here all day!
And on to Galway. the drive from Westport around the coast is stunning especially Killary Harbour Fiord. You will find your favourite things all through Connemara, there are so many.
AND.... just for you, there are sheepdog demonstrations in Galway. 🤗
Sheep Dog Herding Demonstrations in Connemara and Galway (glengowlamines.ie)
Have a great time. Do come back and let us know how you get on.