I came up with an idea for a touch interface for an existing game. I don't know much about coding, but I can design mockups of it, would it be possible to patent such design, or find a way to profit from such idea?
I'm not sure about this, but you can try looking for applications for this on freelance sites. Any demand creates supply, but not vice versa. In order to calculate the profitability of something, you need to understand how much it's in demand and what kind of competition it can be.