Create a .csv File Exchange for eBay with Data Feed XML and a CSV file from my furnisher.

Hello, i have a furnisher of football products that gives me the chance to create by my self a .csv file on his website with some info of his products (stock, pics, description, ecc) that i need to add to another .csv file to upload it using File Exchange on ebay, i also have some data feeds from him but i'm not an expert of data entry (many years selling on ebay but always with Turbo Lister), most of this information has to be combine with my HTML template. I'm looking to have this File Exchange file (.csv) ready to upload it every day (if is an automatic action will be much better) to refresh the items in stock or not, change prices, add or delete new/old items to my ebay shop, ecc Bid only if you can start immediately and finish fast. Thank you.