Drop Shippers csv product file bulk upload to Shopify

I have a drop shipper CSV file with approximately 8000 products, including variations of size and color that I need to have converted to Shopify headings and a potential bulk uploaded.

You can work in Excel or Google Sheets, as long as the final file fits Shopify’s required structure and easily passes the bulk-upload tool.

Acceptance criteria:
• CSV adheres to Shopify’s standard header names and order.
• File uploads without warnings or errors on my store.
• Needs to be able to upload new products as well as update existing products
• Potential for this to be a weekly job
• Potential for other areas of the store development including SEO optimization etc.
Cheers
Y