I wish to establish an online business, but don't understand how to approach

[Shiv]

the wholesaler? Hi, I have done my MBA in marketing and have done a diploma course in Online marketing and web development. I have a regular job but I have this desire of establishing my own enterprise. I have pretty decent knowledge of online marketing and e-commerce. I wish to develop my own website/an online store. I have also zeroed in as to what products will suit my area. I have also worked upon the business plan. However, I don't understand as to how I should approach the wholesale dealers? For example, I wish to sell DVDs of all genres. I also have a comprehensive list of players in this area who provide DVDs at wholesale rate. But, I don't know how to approach them? Will a letter stating what I wish to do, what are my requirements and how the company be benefited be enough? How to look out for companies which provide such opportunities and companies which sell the products on a wholesale rate?? Please reply?? Any reply/suggestions will be highly appreciated?? If possible, please suggest any website/book on the subject too.. Thanx