We don't recommend going through Amazon for several reasons, the most important being selling through Amazon is called fulfillment and is not actually drop shipping. Amazon doesn't let their resellers purchase products from another online retailer and have that retailer ship directly to customers. Also, Amazon makes you (as the reseller) accept and process all customer returns which in traditional drop selling your suppliers will do. Basically Amazon says they allow drop shipping, but they actually don't.
This is Amazon's "Drop Selling Policy"
"Drop shipping, or allowing a third party to fulfill orders to customers on your behalf, is generally acceptable. If you intend to fulfill orders using a drop shipper, you must always:
- Be the seller of record of your products;
- Identify yourself as the seller of your products on all packing slips and other information included or provided in connection with them;
- Be responsible for accepting and processing customer returns of your products; and
- Comply with all other terms of your seller agreement and applicable Amazon policies.
Examples of drop shipping that is not permitted:
- Purchasing products from another online retailer and having that retailer ship directly to customers; or
- Shipping orders with packing slips, invoices, or other information indicating a seller name or contact information other than your own.
Failure to comply with these requirements may result in the suspension or removal of your selling privileges."
The whole reason drop shipping is great is because you (as the drop shipper) don't have to keep inventory on hand, don't have to ship out the product and don't have to process returns... this all lands on your supplier. You'll have to deal with customer complaints/ customer support but that's a small amount of work if you have the right niche and reliable suppliers.
If you really want to start a business through Amazon I suggest you check out FBA Empire - http://www.fbaempire.com/ . They teach you how to go about selling on Amazon =)