Setup Zencart Store with Downloadable Software

I'm looking for some one to configure a new zencart store that would sell items for a non-profit organization. I have zencart installed on a server. I need some one to add the lists for sale to the catalog. I'm new to zencart. I will NOT need you to setup payment processing. I will need you to set up a way for the customer to set up an account to save their data, including previous orders, multiple shipping addresses to choose from, etc. I need the program to figure discounts, and shipping charges. After processing I need to be able to email an invoice that is like the attached Excel file. Our website is [login to view URL] to see what and who we are. We are a non-profit mentoring ministry and are on a very tight budget.