Can't add attributes way I want to

I have no idea how to do this. It is so confusing. I am posting photos in my store. I want each photo to have the option to purchase sizes. For instance, customers can purchase 2-5x7's, 1-8x10 enlargement, or 8-wallets. The way I see it happening is like this... there are 3 radio buttons; one associated with each of those photo size options. Each one of those radio buttons has a price with it. So if they select the 1-8x10 enlargement radio button, it will cost $20. They select a quantity of 2, and the cart will then have $40 in product in it, consisting of 2 orders of 1-8x10 enlargement.

How in the world do I do this? The admin section dealing with attribute names, and values, amounts and what have you is so confusing. I would like an entire category to have this same behavior so that I do not have to do this for every photograph I add to the store. For instance, if I add a new photo to a category, this radio button attribute scenario will automatically work for it. Thank you for your help! I hope its soon! :(

Ok I was able to figure this out, however, I do not want to have to do this for every single photo I put in the category. Is there a way to assign this attribute set to an entire category or product type?

You have in the Attributes Controller a way to copy the Attributes for a Product to either 1 Product or a Category of Products ...