If you want to make "big money," you should pretty much avoid WORKING at startups at all costs. Instead, get a high-paying job at an established company, and invest the difference in the startup's equity.
I've considered lots of startup jobs because I believed strongly in the companies. Every single time, however, I was able to get a larger chunk of the company by keeping my current job and simply investing.
To give an example, my current job pays about $250k, and one year, I invested $100k of that into a startup, leaving me with ~$150k of salary. This $150k + startup equity was a better deal than the startup was offering in both salary and equity. Plus, equity bought as an investor is much less tax toxic than equity options received as an employee of a startup.
On the other hand, most people who work at startups aren't interested in money. If that's you, that's totally cool, and I respect that!