What Not to Do
Junior scholars often make the mistake of either trying make their first publication a peer-reviewed piece in a major journal, or accepting any journal that will publish their work. While the publication of peer-reviewed articles or a scholarly monograph may eventually be needed to secure tenure, scholars who are just starting out, or are not yet in tenure track positions may be better off learning the ropes of the publication process by beginning with book reviews, column pieces or newsletter articles, and saving their best work for somewhat later down the road, when they have a better understanding of, and comfort level with the publication proccess. Also, because tenure committees tend to look at one's body of scholarly work and pattern of growth, publications that are not peer-reviewed may still "count" toward tenure.
Book review editors may target certain reviewers for some books, but often they will also just send out a list of books needing review on professional listservs and give the job to the first qualified respondents. Once you establish one or more areas of expertise (though work on a Master's thesis, Ph.D dissertation, personal experience, etc.), you can search out new books in your areas and approach book review editors about the possibility of publishing a review in their journal.
Not all pieces published in peer-reviewed journals go through the rigorous double-blind peer-review process required of major articles. Column pieces, reviews and various informational pieces often only need to be approved by the editor for that particular section to be published. While these pieces are not peer-reviewed, and will not be judged as such in your tenure packet, they are scholarly publications, and will be seen, if not read by others in the field.
Editors of subject specific dictionaries or encyclopedias often need short articles or blurbs about different authors, films, works, etc. A dissertation or Master's thesis advisor can often help connect you with people who might need short articles on your area of specialty. Another way to attach your name to a subject or area of expertise is to actively participate on academic listservs. Editors often use these fora as a means of recruiting or identifying authors for these kinds of projects.
Newsletters may not have the scholarly gravitas of the more research-oriented journals, but they are still read by core members of the field and tend to be much more lax in their publication requirements. As such, they are great places to begin publishing, sharing ideas, and networking.
Creating (or publishing on) quality websites (for research or teaching purposes) can also be a way to make progress toward academic publishing. Actively participating on academic or professional listservs is another means of doing this. Though these kinds of "publications" would not count in any tenure review, they are a means of sharing information and making contacts, both of which can lead to better publishing opportunities.