I'm a builder. How do I learn to sell?

I don't think I'm the only one in that position:

I'm a developer and love building stuff. I would love to know how to sell and do marketing, but I'm a bit overwhelmed, there is no "Hello World" tutorial for sales, or so it seems.

How do I learn about sales and marketing? Any book/video/online education I can follow to help me?

I need to get out of the pure "builder" mindset I've had for the past 10 years.