how do you teach news story writing to grade eight nine and ten students
how do you get students involved in writing for the school newspaper
how often do you publish the newspaper in an academic year?
There are loads of "how to" lessons you can find on an internet search. I also am a big fan of project-based learning; start with the end in mind, "class, we're going to publish a newspaper," set your first deadline, then go from there.
You can use posters, word of mouth, and personal invitations if you are doing your newspaper as an extracurricular activity. If you can secure extra credit (or grant it in your class) for students who write articles, that can be a great incentive.
I think that once a month is reasonable for publishing a school newspaper, having done it myself with students. Any more frequently is difficult unless you have highly motivated students and a good desktop publishing system at your disposal. Less frequently doesn't lend itself to teaching them how to meet deadlines, which is a crucial component of journalism.
One of the best sources for information on school newspapers is the Quill and Scroll Honor Society for high school journalism. Their website is http://www.uiowa.edu/~quill-sc/
You could get students interested in writing for the school newspaper if you get them started on writing a newspaper for class to see what subjects they are interested in and their writing ability. You could also have small awards for the class writers.
If they can produce a newspaper for class, then perhaps they have the ability for the school newspaper. Also, talk to the students already on the newspaper if they have additional openings for new members, or if new students could cover new areas.
I think most school newspapers come out either once or twice a month depending on the size of the student body and financial support from the school.