Need advice on creating an ecommerce website to sell branded makeup

I found a local wholesale shop that has multiple cosmetic high end brands (makeup). They are willing to sell their products to me at wholesale price even if that means just 1 piece since my friend manages the store.
I wanted to create a professional authentic website to resell these luxury makeup brands but the issue I am having is inventory. I dont know when an item goes out of stock and it could take them 1 week to a month to restock and sometimes they might not even re stock that item. I can keep in touch with my friend who manages the store to check for availability but i wanted a smooth process for the end consumer to just click and buy from my website.
He did tell me that 4 of their brands he manages to almost certainly get them re stocked within a week but thats still risky and do keep in mind a single brand has over 100s of products and buying in bulk at this time for me is not feasible nor can I afford it. Also selling just 1 brand to begin with wouldnt make too much sense to me as the whole goal of the website is to sell multiple high end brands.
What would be the best solution for me in this situation? I was considering just starting off with instagram shop but that seems shady here and it would seem as though i am selling fakes. I am based in Dubai and usually these tiny insta shops here are known for selling fakes.
Any advice would be highly appreciated, thanks!