Do some Excel Work

I have a few excel documents with different layouts and similar information, but I need to convert one maybe a few to one excel (csv) file to be uploaded to a ebay via file exchange or turbo lister. there are about 5000 products. however it is clothing so variation listing would be needed so there are probably thousands more individual items. I happy to do some of the work if needed like they all have a generic listing and then I go in and modify them individually with the layout I want on ebay. I only need few brands to start with so about 1000 products. Please message or call if poss to discuss this further