Buying a 1st boat
To start are you near a coast line or a lake, where you’ve seen sailboats before??
If not, consider moving. If yes:
Then, I’d suggest you go by a Yacht Club, meet some of the people there, and enroll yourself in some kind of sailing course. (who knows if you don’t hate it in the end?! – most people that “dream” about sailing the world are attracted by sunset pictures, tequila sunrises, and, old sailor bull****, then, and as soon as the sea “hits” find out that’s not really what they expected the money was spent in a boat, and now… too late to quit).
I’d shoot for a few rides in small boats, then a sail course, maybe?
Only then should you think about buying a boat and slowly increase your horizon, (and if God helps, your boat’s size!!)