Source of legal regulation of international heritage

Good evening everyone Website on OpenCart / Theme: Sports Nutrition Languages: Russian and Ukrainian Need to write SEO articles, without unnecessary exaggerations, for each product category on the website. There are approximately 100 categories Number of characters: About 3-5 thousand. It can be more or less, the main thing is to use the keywords in the form of the Category Title. Please provide the price for 1 article in both languages.