1)Product review: Memory foam pillows
>>>You haven’t provided ASIN number of product that you have selected. But I guess you are talking about similar product.
This above similar product has a lot of listings, if you search on amazon there are above 60 listings, that means the day you will launch the product it will be somewhere between 3-4 page as Amazon show 15 products a page.
So even if you do better listing and get friendly sales and reviews then also you will hardly go to page 2-3 as in first 2 pages almost all the listing have reviews. But unless you are not getting your product listed on page 1 it will be difficult to get sales.
2)I am not sure if we should start with such a huge quantity at the beginning, please suggest.
>>>If MOQ/OEM is too high go with neutral brand. All you have to do is put your company name on a sticker and put it over product. Now while listing you just need one UPC which we provide to list the product on amazon. You can also provide trademark document to amazon which will lock all your listing for existing sellers.
Try to talk with another manufacturer who is willing to give you private label with low MOQ. Try to convince manufacturer that first you buy 2-3 cartons then you will purchase high quantity with same manufacturer.
Let me know if you need any help!