Where's a good place to find marketing people? I feel I'm strong at finding good developers from various weird and wonderful channels, but I have no idea where to hire marketing types?
Asking around your network, maybe https://growth.org/ (I don't participate there but it's a large marketing community), marketers at companies you admire who've been there for 2-3 years and you suspect might be open to a change, and good marketing blogs. Some ideas to get you started, at least.
Depends what type of marketing you are looking for. For example, if you are looking for social media marketing, browse whichever social networks you want to target.