I would suggest you use the hn search for all people who post about learning or wanting to program and offer them a free course in exchange for them writing blog articles about what they liked and didn't like.

Also - on your website you need to be more specific what you actually do. It says "rails tutors" which is specific but it doesn't tell me a) when it happens, b) where it happens, c) what i'm actually going to learn, or d) why it matter.

Here's a good example of someone (Amy Hoy) selling a course -> http://javascriptrocks.com/performance/

The other good example of someone teaching courses http://railscasts.com/

In the real world you can always use skillshare or meetup to target groups of people who are programmers (ruby and or rails) or want to learn to program and meet them in real life.

Good luck!