Thats a BIG garden! Try landscape gardeners in the golden pages. If you are in North Kerry I know someone who does it and can PM you their name- I have no connection to them. Or you could try to design your own- you will have to do a little research though- check your soil type, check what parts of the garden get sun, which parts are exposed to wind or salt spray etc. There are sites on the internet that will allow you to design for free- I think theres one on the BBC website- but alas, you may have to buy a few books to give you design ideas plus you will have to do research into the right kind of plants for your garden. Worthwhile if you enjoy it, or see it as a future hobby- but a lot of work.