Write To Done (http://writetodone.com/) & Jeff Goins Writer (http://goinswriter.com/) come to mind.

Start offering something for FREE - a blog about how to write better for tech startups or ebook on the same topic, or better yet combination of those two.

Identify who you write for and have signup form on the blog. Offer free ebook for those who sign up. Build an email list.

Establish your authority on your niche.

This is not an overnight effort but this is one good way to get a headstart IMHO.