Those who are saying 30-50 Euros on food is easy/generous... Aren't things more expensive in Ireland though?
I don't know any specific books.
I use www.foodgawker.com these days for pretty much all my recipes. Just see what takes your interest, plants of things freeze, well a few things don't. Ay meat in sauce will almost certainly freeze well, so spag Bol, chili, meatballs, curry, stews etc.