I think it already starts with what you stated: "I don't really have one yet for YouTube, per sè."
In this digital age, with so much music around the Internet, still a lot of artists paying others for marketing, one really need to take all the available and used business approaches to market you 'product'. Marketing you product, you can hire people for that, or you do it yourself. Regardless, it'll gonna cost money. When doing it yourself, you have to get yourself familiarise with the algorithms of YT. How do these work. You have to test various things. You have to spend money on promotions and figure out what works and what doesn't work. And as with any social media, you have to get active in engaging. I would say: Engaging with possible fans, not with other artists. Reaching from above ground level in the pyramid of music all by yourself, it'll gonna costs lots and lots of time, and some to more money. Ie, investments across the board.
