Hi Annalisa,
Sorry, I've barely been able to log on when I'm interrupted and have to log off again, it's been a crazy couple of weeks!
Thank you for your response to my topic! - I've had both a client approach me and I've approached clients.
I've approached them with ideas such as updating out of date content for free among others. I was approached when they wanted a specific topic done.
A good idea is to let yourself be known, send letters/emails around. Then when something comes up they have YOU in mind to write for them (this is another avenue I've tried.) I still get calls/emails about things from months ago, you just never know where these may lead.
You may have noticed that one of the topics I actually asked about on here when someone approached me to do an article just on "baby first aid". This is very broad, and whilst I had an idea of where to go I asked on here what ppl would like to see under that title. That helped immensley and helped me to fine-tune my thinking before getting started.
Usually for me, I have a structure of where I want the article to go. Then the hard part is how to start it. Once I start I find the rest just flows. I then ask others to read over it with "fresh eyes" that know little about the topic to see if the message gets through the way I want.
It's a bit of work, but it's worked out quite well.
What kind of topics did you have in mind? Is there anything I can help you with? Just let me know :-)
Must go, kids are about to kill each other and I have a 2 hour drive ahead of me, trying to eat breakky and kids have yet to have a bath they so desperately need... 
- Shell.