If you're planning to pickup the Wild Atlantic Way (starts in Kinsale) then I'd recommed a good guide book. I used
Road Trip Ireland Guide Book - The Ultimate Ireland & The Atlantic Way Guide by Robbie Roams
Following the Wild Atlantic Way is very easy as the route is well signposted. Just don't get caught out by following a sign for the Southern route when you're heading North or vice versa. There are also loads of WAW signs directing you off the main route to all sorts of different points of interest so just try a few at random - I was never disappointed.
If I was visiting Ireland again I'd make more use of off-grid parkups and less campsites. Just get the Park4Night and searchforsites apps on your phone for ideas. I pre-booked campsites and probably didn't need to as it became quite restrictive having to aim for a specific place each day.
These are the campsites and parkups I used between Rosslare and Sligo.
Have a good trip!