Remember to read articles to familiarize yourself with various types of writing in the field.
The article below list some common tips to improve business writing. Click on the PDF for the fulltext of the article.
"A trade magazine, also called a professional magazine, is a magazine published with the intention of target marketing to a specific industry or type of trade. The collective term for this area of publishing is the trade press. Many trade publications can also be considered news magazines with a very specific topical focus." - Wikipedia
Trade journals have titles like: BioTech Week, Chemistry World, Chiropractic Economics, Coach & Bus Week, The Grocer, The Lawyer, Nursing Times, Walls & Ceilings, etc.
The libraries subscribe to many databases that provide access to news, magazine, trade, and scholarly articles.