For an insightful look at creating modern commercial type this talk[0] from Typographics 2017 features Kris Sowersby of Klim Type detailing the process of taking his "Untitled" fonts from inception all the way through to marketing. You can find some other videos where he discusses adapting historical typefaces which may also be of interest.
In general Typographics[1], The Type Directors Club[2], and Type@Cooper[3] all have good talks depending on what you're looking for.