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It's very easy to get started with Amazon Marketplace. You don't need to register in advance. You can open a seller account when you list your first product.
If you already have a buyer account on Amazon you can add your seller account to that.
To register as a seller you will need a business name, an address, a display name, a credit card and a telephone contact number. That's all you need to get started.
Go to the Amazon site, scroll down the page to 'Make Money With Us' and then 'Sell On Amazon'. You will then see two options:
Sell a little or sell a lot? Amazon offers two entry points into Marketplace which they informally tag as 'selling a little' or 'selling a lot'.
Basically 'a little' is for occasional and hobby sellers who expect to sell less than 35 items a month. It costs 86p plus a referral fee for each sale. You are also restricted to the product categories you can sell in. However, the advantage is that it costs virtually nothing to start and there are no ongoing charges if, initially, you don't sell very much.
Selling 'a lot' is for professional sellers who expect to sell more than 35 items a month. You pay a 28.75 monthly fixed fee and a referral fee. You can sell in all the Amazon product categories.
It isn't always viable to list low price, low volume products as a 'sell a little' seller. To do that you need to be a 'sell a lot' seller! However, I'd recommend you take the 'selling a little' route to start out with. You can always upgrade later.
Choose your option, then fill in the online form.
Pro Merchant Sellers
Once you are selling 'a lot' you will probably also want to become what Amazon call a Pro Merchant Seller. Pro Merchants have access to volume selling and bulk listing tools. There is a web interface that allows you to more easily manage your product descriptions, inventory and orders. You will also be able to export and import information to and from your account.
Once you get up and running the selling a lot/Pro Merchant option will work out much cheaper and, importantly, will allow you to work on tighter margins and make money from sales that those who sell just a little can't.