only advise, no work needed for 100 euros :manage domain and multi-websites for dropshipping inside same domain IN WORDPRESS

hello, i need help and advise i give 100 euros only for this working advise : - i have a domain caller : [login to view URL] and i need selle for dropshipping many products INSIDE A SAME WORDPRESS - i need each product sold in FRENCH, ENGLISH, RUSSIAN AND SPANISH - i do not want only one webiste with translating with all products inside the same shop. - i would like make seao, sem for each product and make adversiting in each language which i speak, to make the best promotion and benefit for each product for each language. - for example russian client want products sold by russian website, so they need get access to "russian" products inside the russian version of my website, the same is needed for each language. - if i make seo and sem for each products, each product in all languages, if all is sold inside the same domain, the seo final will be better FOR MY BOUTIQUE - the problem is : is needed be abble to use the same theme but changing the tamplate demo for each product. : send automatically invoices for the right one language, actually if i use a page with different language is possible but is same invoices for all pages... that is the problem. AT ALL, ALL MY PRODUCTS ARE IN LANDING PAGE SO IS NOT ABLE FOR CLIENT CHECK ALL PRODUCTS IN ALL LANGUAGES. IS NEEDED BE ABLE TO MAKE A PRODUCT PAGE IN LANGUAGE I NEED, TEMPLATE I NEED, AND INVOICES LANGUAGE SENDING I NEED / ALL INSIDE SAME DOMAIN AND WORDPRESS.