Distribute premiums at trade shows and speaking engagements, send to editors you know or would like to work with, and give to customers. Many charge a small fee or no fee at all for listings of businesses that will benefit their members. Choose groups comprised of likely buyers of the writing service you offer. Your business gains an implied endorsement by appearing in a membership directory. As an advertiser, you may receive a copy and the added bonus of a mailing list.
Many websites offer free addresses, including basic set-up.
Some require a paid subscription, others involve no cost at all. If you offer more than one service, consider multiple sites, each specializing in a different category. The trick to making a website work is to attract enough potential customers to warrant site maintenance. Arrange free links to other pages that draw the same type of viewer. Include your web address on other promotional material.