Oguz Kagan Meydan

I have a limited company and I have a VAT number. I have made many sales so far and I would like to file a tax declaration. ETSY has not issued any invoices for these sales and only sends me a file in CSV format. No one from my customers asked for an invoice, I did not issue any invoice for my sales, because I did not know the necessity of this. I only have CSV files with details of many sales. What should I do in this case?