Yep, New Zealand. Welcome Deigh!
We'll try to lend you a hand. Let's start with you telling us more about your stuff:
What model Mac?
What OS are you running now?
What discs exactly did you get from ebay? They weren't grey were they?
Do you have decent internet? Maybe we can get an idea how deep you're in it with this info.
What do you mean "the computer won't read them"? What happens exactly when you try?
Worst case, you're not very far from Auckland… there's got to be someone there who can help if it comes to it.