So you want to start your own country. This is a reasonable life goal. What's the process? Joe Bereta of Epic How To gets you started on the major benchmarks of being a country. It's pretty hard at this point because almost all land in the world has been claimed by someone and it's difficult to forcibly take over a country with just yourself and your buddies.
One option that Bereta leaves out is purchasing territory from a government that agrees to relinquish sovereignty in addition to the land. A sufficiently desperate government (say, one that is losing a civil war) may be willing to do so for cash. Just take care of that chore and soon you'll have currency with your face on it. Good luck!