If you are dealing with an email fanatic, chances of cementing a future relationship are much greater if you use email. Make certain your address is included on all stationery. Having email underscores that you are current and accessible. I have a personal policy of always answering my business phone when I am at home. Many a tired executive, making last minute calls before heading home well after normal business hours, is duly impressed when they connect with a person.
Accessibility is a key differentiating factor for a home-based business.
You do not need designer stationery but on the other hand, you do need something more imaginative than stock items found in a software program. Similarly, your corporate information package and other advertising pieces require thoughtful consideration. The best rule of thumb to use when developing this material is to know your competition. You may not be able to afford a glossy brochure but on the other hand, you can't look like the poor cousin either - these expenditures are investments in the future. Little things also make a big difference in terms of the professional image you portray.