Affiliateburn...these guys are giving great advise.
When I started business, I started with an online store doing drop shipping. So I went through all the steps to get a state and Federal tax id. Had to. Most manufacturers require them before they'll drop ship for you.
I don't have the online store anymore. Dealing directly with customers, taking returns and entering orders can be a flat pain in the ass. But I maintain the company, file $0.00 taxes quarterly and pay my county $30/year. I'm planning on offering products in the future, so I keep the business status going.
It's also nice to be able to give tax ids instead of the social.
But, they are right, if you don't mind giving out your SSN, you can certainly start out without a tax id.