The thing is that I don't like "sales people" for the most part, I don't want to listen to their advice. I'm interested from hearing thought of other programme

The thing is that I don't like "sales people" for the most part, I don't want to listen to their advice. I'm interested from hearing thought of other programmers / developers that created something small and were able to "sell" it. I think this advice will be much more applicable than from a "sales person". I might be wrong, but I feel like sales people learn the wrong thing on the job. If you read other comments it seems that small businesses are getting swarmed by soul-less calls from these people that will lead nowhere. That is the exact thing I want to avoid.