Fulfillment by Amazon (FBA) is a service offered by Amazon that allows businesses to store their products in Amazon's fulfillment centers, and the online retail giant takes care of the storage, packing, shipping, and customer service on behalf of the seller.

If you want someone to manage your Amazon account for FBA business, it means that the person will handle all aspects of your business on Amazon related to FBA, including receiving, storing, and shipping products on your behalf, as well as handling customer service inquiries.

In addition to FBA management, the person you hire may also offer Pay-Per-Click (PPC) management, which involves creating and managing advertising campaigns on Amazon to promote your products and drive sales. PPC management typically involves researching keywords, setting bids, monitoring campaign performance, and optimizing the campaigns for maximum results.

Finally, the "A to Z" services offered likely refer to a comprehensive suite of services related to your Amazon business, including but not limited to account setup and optimization, product listing optimization, and ongoing account management. Essentially, the person you hire will handle all aspects of your Amazon business, leaving you free to focus on other aspects of your business.