Amazon Product Listing help

Hello
We sell a product called Zobria - https://zobrialowb1.com. We list our single bottle products on Amazon: https://www.amazon.com/Zobria-LowB1-Support-120-Capsules/dp/B00FP12CPK/ref=sr_1_2?keywords=zobria+lowb1&qid=1639086829&sr=8-2

We need help with the following:

Create a product inventory list (that includes our current available amazon products and the other listings not on Amazon)
add additional product listings - including our 3bottle and 6 bottle products
Fix any obvious errors in our listings
update inventory
Make the products available for Subscription on Amazon (not Amazon FBA)
Provide any feedback about our product listings

This should be a quick project for anyone who has knowledge of selling on Amazon.
Please provide price and we will need this done quickly!

Thank you