1) Create 1 post for each product and post it on your Facebook page. Make it as you'd make a normal ad. 2) Create a PPE campaign. 1 adset, broad targeting (always include engaged shoppers), 3 ads using the post's ID (1 per product). You can create 1 adset for every 3 products you wanna test. Spend 10-20$/day per adset. 3) Let them run for 3 days and see which ones are getting the highest shares and reactions. Some of them will get link clicks and sales. 4) Create a Website Conversion campaign. 1 adset, same targeting, best ads with the same post's ID. Facebook should keep the likes you received from the PPE campaign. This will give you social proof too. Test 3 days at 10-20$/day per adset. 5) Scale Don't target 3rd world countries or all tier 1. I always test the big 5 English speaking countries, they dictate trends online.