Amazon/Walmart listing assistance

I am the owner of a surfboard brand that has been selling on Amazon.com for many years, and looking to expand on Walmart.com. I have 8 different colors on 7 total board models, meaning 56 total sku's. I would love to have some assistance in managing the listings, A+ Content creation, managing content, imagery, etc. Experience in Amazon/Walmart.com list building is required.