It's great to hear that you have plans to come over and do a spot of camping!
There are indeed a few different websites for information, we have an accommodation page
that may be helpful to you. The where do you want to stay section has filters to select the location and type, I have pre-selected camping to get you started.
There is also the Camping Ireland
website where you can search for sites by county so another great place to look.
Have you an idea of where you would like to visit?