How do I get the Amazon warehouse address(es) to send to my supplier?

I’m in the early stages of launching my business. I have DDP sea shipping estimates from 2 potential suppliers but I used my current address so far to see the cost (and told suppliers the address was subject to change). I haven’t created my listing or set up how I’m sending my inventory to Amazon yet. I assume the warehouse address comes once I fill in inventory details. I want an accurate shipping estimate but know I need Amazon warehouse addresses to do so, as well as a freight forwarder (which I also haven’t found a thorough explanation on without having to buy some “expert” seller’s package). Really need help connecting the dots between getting the warehouse addresses and sending them to my supplier. Can I do this with what I have now (supplier quotes, no listing, no inventory set up)?