This works for me:
1. Finder -> New Folder
2. iPhoto -> Get Specified iPhoto Items
3. Finder -> Copy Finder Items (you'll have to create the folder to put it into this step; don't worry, because you can delete it later and it'll get automatically made by step 1)
4. Preview -> Change Type of Images
5. Preview -> Scale Images
6. System -> Burn a Disc (this is the one part that fails your requirements, as I don't see any way to ask the user for the name of the disc. You can have a standard name and have it append the date after it, though)
7. Finder -> Get Specified Finder Items (select the folder, which has to exist, as in step 3)
8. Finder -> Move to Trash
Voilà!