How do you add new products and synchronize prices / availability between different marketplaces?

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I have one channel for sales. I have a shop on shopify. I want to run on Amazon and eBay. The total is about 700 items and I don’t know how to do this better with my assortment. Should I add everything manually or look for a specialist or use some kind of tool? It is also not clear how to synchronize the prices and availability in the future... Share your experience