Paula, I think your best bet is to look through some of the recent topics covering this very question.
There are several trade publications and their tel nos and web sites are listed here on the site in various threads. There is no mag specifically for manicuring. But if you have any questions regarding products etc. post hem here.
See above where it says 'search'? Click there and put in trade magazines! You will get loads of information. Scratch Magazine gets my vote.