Long-term career paths for an ambitious developer?

I'm a dude, late twenties, married with kids..I work as a developer at a largeish company.. I enjoy the work I do and I get paid pretty well. Despite my career still being fairly nascent, I'm starting to feel like I can almost see the plateau of it both financially and from a personally rewarding standpoint. In other words, I've advanced relatively quickly and am making good money despite only beginning a career in software development a few years ago, but I'm beginning to think about what the future might hold beyond sitting and writing code all day for decent pay. Obviously, a lot of this question cannot be answered by anyone but myself (I need to do some soul-searching), but I'd like some perspective on what my long-term options are going forward. I know management is an obvious possibility, but I do enjoy actual development a lot which doesn't seem to be something managers do much of..perhaps there's a distinction between manager and technical lead? I also sometimes feel like I'd love to ultimately start my own business or launch a startup, but I feel like there will never be a time where I can afford the risk of time/money given my family situation (married with kids) and current expenses. Should I find out what I'm passionate about and go the lean startup route on nights and weekends? Should I first gain more technical experience and not even think about starting my own thing for another few years? Maybe my time would be best spent learning other technologies and broadening my horizons on that front? Really do apologize for the somewhat incoherent rant, but the only to give a sense of the kinds of things I'm thinking about was just to let it all out. Any general career advice for a young developer would be greatly appreciated! Thanks!