I know of three authors who have been stalked, and there are probably many more. Don't advertise your phone number and street address. Scout for mutual website opportunities, where you can share the cost of additional promotion online. Many authors have joined others writing for the same house, and will welcome you. The group has done joint advertising in Romantic Times, shared many contacts for promotional opportunities, produced promotional materials for distribution at conferences, and is a solid, supportive network.
Membership is free.
Join Pan and Panlink. There are free online promotion opportunities that can be accessed by readers, booksellers, and librarians. List your books with the RWA website. Put your website address on your stationery. Check out your book's listing on Amazon, Barnes and Noble, and Borders.