Hey! Now THIS is a cool project. I've never done anything on Freelancer but apply for jobs, but I do have experience in writing all manner of different things. I can provide you with examples of articles I've written, but in the PM I'm going to send you the sales letter I wrote for a product I released last year.
I lack the marketing skills to get the word out (building an email list, launching a PPC campaign, etc.), but I have been told I write well. Of course, that's all opinions. You can judge for yourself.
I believe I can knock out the promotional/informative articles you desire and the sales page within 3-5 days. I think I can do it in 3, but I'd rather be safe than disappointing. I want my first feedback on Freelancer to be great, ya know?
If you're interested in speaking further, I'll ask a question or two in the PM section. I sound so secretive...
Thank you for the opportunity. Pick me!
-Chris