$150 is a lot, but also not a lot, if that makes sense. I'd recommend picking up a skill that makes money rather than thinking about where you can spend that money. There's a lot of free resources for most of the big ones like video editing and social media management, for example. You're better off using any money for the things you really need to get started, rather than spending it all in, say, courses, tools, and subscriptions before you've made your first buck. Hard to say how to pull it off outside of concept, but it's doable.