Step one, and I really cannot stress this enough, is to screw up your courage, take the plunge, and hit send. Forget your fear about being exposed as a literary fraud; tell your imposter syndrome to shut up, already. (And if in thinking, Shut up, imposter syndrome, you make proper use of the apostrophizing comma, soothe yourself with the idea that you could soon be in really solid company.)
Coax up in yourself the kind of patience that is also a kind of impatience. You want to change the world, but through print and pixels, so this should come fairly naturally to you. Write your first email with pizzazz, with passion, with professionalism. Have a dynamic introduction, explain your immense qualifications, but with a little self-deprecating humor—we’re feminists, after all.