Netherlands Clothing - Fashion Importer Companies

I am in the process of establishing my own burkini line. I have already created a digital sketch and selected a brand name. I would like to have a sample produced by your team to evaluate whether I will continue my production with your factory. Could you please inform me about the options available and let me know precisely what I need to provide to initiate such a production line? I am based in the Netherlands and am also interested in understanding if and when a visit to Istanbul might be necessary. I look forward to your response. Thank you in advance!