Magazine price and how often published

When thinking about the pricing of magazine I considered how much your average student would have to spend on somthing which isnt a necessity and this isnt very much so i have decided to have my magazine price as either a really low ammount eg: 20p or to just have it free but i dont want people to see that it is free so they take one just for the sake of it and have no intention of reading it so 20p or somthing low is probably a better idea beacuse the people buying it will intend to read it. I am going to publish my magazine once a month becuase i want plenty of information in it and not just enough to fill a couple of pages and I dont want to be scraping for stories.