The internet and social media has made a massive impact on the industry of small business. It's easier than it's ever been to start up your own venture and throw yourself out there, but because of that there are far more people doing so and it's easy to get lost in the mix. Sending things out with sold orders will help to show your customers you're professional, and you plan on being around for a while. However, it's very important to remain consistent with your marketing materials. Having flyers, handbills, and business cards is great and all, but if they're all completely different it can be confusing to someone who gets more than one of what you're offering.
I based my company around a business plan that I created through my marketing class in college. Thanks to that, I already had a business practice lined out, a name and slogan nailed down (probably spent the most time on that), fonts chosen, and my own logo ready to go. Chances are, though, that you're going to change your mind at some point. It may be better to plan and re-plan (I got up to a dozen times restarting over years of contemplating) as you build up your inventory before actually launching your business. Once you've got that all figured out, though, getting through the flyer, business card, and whatever else you want design is eeeeasy (I find).
Use coupon code RIOT10 for 10% off at Hellhound through the month of August. :)