Go to your nearest, large, newsagent and browse the magazine section, every one of them is a potential market, buy as many that you can that interest you and read them from cover to cover, adverts, everything to assess the readership, jig your articles to suit.
One of the tricks is to look at the Mag's masthead over several issues. If the same names keep appearing, they are probably staff writers, the mag will have limited openings, if there are different names for each issue, take heart, this could indicate they take mostly freelance work.
Always for a profit, do not let magazine editors play on your insecurity, if they can afford to run a mag, they can afford to pay for the content. When writers, write for free, 'just for the experience,' they are doing a disservice to all writers.