How to import products to Marketpress


I just installed Marketpress and now I need to import a list of products from an old ZenCart site. Can you point me to any instructions on how to import a list of products? I hope to import the product list and any links to product photos and categories as automatically as possible.

I will want to have a couple of different ways to search products by manufacturer and by other product features. Is that best acheived by categories or tags or both?

Thanks Martin