Hi roshaandmy3sons,
Welcome to SaleHoo!
Requiring you to provide a Sales Tax ID is one of the ways for suppliers to verify your legitimacy as a business. It helps them confirm that you are not a retail consumer who is just trying to obtain products at significant wholesale discount. :)
Getting a Reseller License /Sales Tax ID is fairly cheap and easy, and if deciding on a business name is what's holding you back, I suggest that you can just think of a general term that will encompass several possible categories of products you plan to get into. :)
Our Education Resource is full of articles useful for a start up online selling business, You can access them by clicking on the Education tab above. Here are some links that can help -
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Let us know if there's anything else we can do to assist you. :)