Could you please be more specific about "publish for sale" and "run a couple of promotions"? What does that mean - where do you publish for sale, where do you r

Could you please be more specific about "publish for sale" and "run a couple of promotions"? What does that mean - where do you publish for sale, where do you run the promotions, what's the approximate cost? I have a lot of trouble marketing my product. I'd appreciate your insight.