Hello Robert Parker,
Thank you for your post!
You see, Store Manager requires a specific .csv format.
Product import requires category names (specified in text) in order to avoid duplicates and confusion.
Concerning images. Store Manager operates with a new storage system offered by PrestaShop from version 1.4.3, where all images should be sorted in the appropriate subfolders (directory path generates basing on image ID).
Store Manager for PrestaShop allows you to import images from the local folder (you have to specify the exact folder on the hard drive of your PC) or from external source (image URL).
You're welcome to find more info about product import in the article below:
Also you're welcome to find a detailed instructions on how to import product images from local PC and external source in the following articles:
Let us know if you have any other questions.