If you're not comfortable making "cold calls," get someone else in your office to do it or forget it altogether. But don't forget to make follow up calls to everyone who calls you.
If somebody asks for a brochure on Tuesday, call them next Monday to make sure they got it. And when you're talking to your prospect, say their name about 2 million times.
There's nothing sweeter in the English language to people who hear their own name. It's a great sales tactic for you and creates a warm and fuzzy feeling for your prospect.