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I'll be blunt: simply forget about your postcard drop. It won't work and it won't get you business.
I would agree on the postcard thing as you have proposed and Big Mark has mentioned here. But if you already have them, don't throw them away just yet . . .
In my town, the Chamber of Commerce is always sponsoring a lunch or some other business-to-business event. They even sponsor a small business forum where individual businesses can set up a table. I would search out such organizations in your community, and make the effort to attend them. Here is where your postcards handed out in person will likely be remembered much more than just a business card (although have them as well). A postcard with all of your marketing on them will likely stand out because of their uniqueness. And those who pick them up are more likely to call you because they already have their interest piqued.
Also, these somewhat informal gatherings will help you with personal contacts (often referred to as networking). They will help you overcome any social skill shortcomings you may have too. In short, you can get your [name, face, post cards] out there, and be targetting those most interested in your services. I would suspect you would get a better return-per-postcard in this way . . .
Good luck!!
Best of luck.

