You can use any scale you like. What I tend to do is the Fibbonaci (1, 2, 3, 5, 8, 13, 21, ...). To set the baseline of the scale we took a golden story which was average size and valued that with an 8 and one with a little less size and valued that 5. We now just value all the other stories to those two. And since you are working Agile you are just continuously improving. So if you feel that you need to have different golden stories: just do it.
The PBI (Product Backlog Item) work item is not the Product Backlog itself. It is the story on the backlog. The Product backlog list all the stories you would like to implement at some point in a specific order (hopefully the one with the highest business value is on top). When you want to pull a story into a sprint you change the iteration path. It is now pulled off the product backlog and shown on the sprint backlog.
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