There is a ScrollBar component which the UIScrollBar is derived from that you should be able to use. Check the Help documentation for info on how to implement it.
As for the ScrollPane, if you decided you wanted to use one, what you can do is place all your images into a movieclip, assign that movieclip and instance name, and then assign that movieclip as the ScrollPane.source property using its instance name.
I'm going to try the scroll pane - however, all my research into the help file regarding the ScrollBar has only talked about it in relation to text fields, and not at all to movie clips...:(
The UIScrollBar is specifically for textfields, but the ScrollBar is not (you cannot drag it onto the stage as it is not in the library... you must create it using code)... at least that's what I remember when I needed something like you are after.