Finding the best logistic/fulfillment/shipping solution for my e-commerce

Looking a logistic specialist to find the most affordable and reliable solution for our e-commerce fulfillment + shipping operation worldwide: Two scenarios : - 1st scenario, products manufactured in bulk in Japan (Fukui) , shipped worldwide to individual customers, main markets North America and Europe. But shipping must also be possible to customers all over the world. - 2nd scenario, products manufactured in bulk in China (Qingdao), shipped worldwide to individual customers, main markets North America and Europe. But shipping must also be possible to customers all over the world. Find the most cost effective solution for each scenario. Solutions must keep reasonable lead-time. Must be as eco-friendly as possible. Packaging for the individual orders must be eco-friendly (biodegradable and recycled, no plastic) SKU details: Products: T-shirts Weight: about 150g for XXL 9 designs Each design available for both Male and Female Sizes for men: S-M-L-XL-XXL Sizes for women: S-M-L-XL Number of SKU for men = 9x5 = 45 Number of SKU for women = 9x4 = 36 Total SKUs = 81 Simulation for 5000 t-shirts: *Packing Box Size- D450×W610×H300mm Weight- 1.5kg/box Capacity- abt 50pcs of T-shirts/box *Weight sumilation 50pcs- abt 10.2kg/box 5,000pcs- abt 1,020kg/100boxes I need the average handling/fulfillment cost per individual order + shipping costs. I need the postal shipping costs to final customer, for all countries, including incremental costs for customers who would order up to 18 t-shirts.