A teacher could also provide issues of the magazines that print students' work, especially ones with classmates' work, to make it easier for students to see what type of material tends to get accepted. If the cost of buying these different magazines is prohibitive, the teacher could display copies of classmates' poems and stories that have been accepted for publication and the names of the magazines that accepted them. It is important to do whatever one can to provide students a better idea of who publishes what. Most of all, be encouraging. Don't let rejection stop students from submitting material.
Persistence is important.
If at first a student's work is not accepted, he should not give up. He should keep on submitting. If one does not submit, one cannot get published. The sight of a child's face when he sees his work in print is worth all the effort. I have come to the frightening conclusion that I am the decisive element in the classroom.