One way to serve your profession/field of study is to serve as a peer reviewer. It is also helpful to know what reviewers are looking for, so when you are interested in identifying a journal and submitting an article, you are better prepared. Typically, when an editor is seeking a reviewer, he or she will make a call on the journal's homepage, or through a professional listserv.
Here is an example of a call for reviewers from Oxford University Press' Lab Medicine.
There is another benefit of serving as a reviewer. If you assign your students to use a peer-reviewed article as a source, you can explain the process having seen both sides (reviewer and author).