You don't need a school to learn the basics of selling. You already have the knowledge, what you need to expand on is your confidence and structure. Structure is easy. You are a hacker, thus design comes to you naturally. In sales, design applies to the steps needed to find and move prospects from one point to another. Something like: prospect sees your first ad after searching for a product like yours, prospect visits site, subscribes to mailing list in exchange for free report, receives three different emails that try and clos the sale, if nothing is sold then receives a link with a video brochure, etc., until the sale is closed. It is just hacking, and I even code my own marketing campaigns in code. You should try it out.
Now, confidence. That you only get by selling something every day. No matter what the outcome, you go out and sell.