I'm a semi-retired professional engineer but have always enjoyed writing.
All genres, not just technical. I looked at one or two professional journals which might carry stuff I wanted to say, which I thought might be of wider interest. Contacted the editors. No dice with the first, but with the second .....
A bit of negotiation and adjusting my material to meet his readership, style, space and advertising revenue needs, and the offer to contribute free of charge, and now I have my own one-page monthly column alongside other 'experts'.
Honour satisfied, but then the day after the December edition was published, I got an invitation to speak at a national seminar from one of the readers. On precisely the theme I wanted most to 'plug'.
Maybe one day there will even be some income arising.
Joined Mumsnet as a grandpa for (let's admit it) a bit of work-related safe social networking - and I'm hooked totally on the full spectrum of threads!!
Will follow your thread with interest, for further ideas.