You have gotten a lot of good advice. Regarding pro-Bono I just got back from donating an hour to an established charity that has a marketing person.

In my area there is a Meetup form Meetup.com that has an emphasis on Social Media, it meets once or twice a month with all levels from know nothing to expert. A wealth of information and some in that group have also donated services.

I have a membership site that helps those with a limited budget ($97 a month) Set up their foundations. Understanding keywords, setting up a WordPress site, setting up various social media platforms. As a bonus, one day a month I offer access to me, currently that's a 20 minute Skype call where I can answer your specific questions.

Whether you invest time yourself and utilize free resources as some have suggested, or utilize some of the other resources it is vital that you invest in marketing. I would also agree with others, that at $10 per hr you'll basically get an employee who can implement pieces of a plan but not much in the way of strategy or a plan.