I have to agree with the posters above. One I got a 1980 xs400 for my first bike. I did an entire engine rebuild on it and was ready to hit the road with my hipster helmet and everything.
But I quickly learned that I wasn't learning to ride a motorcycle. I was learning to ride a carburator. And one that always seems to deliver a different air fuel mixture. So Everytime I start my bike there's no consistency with the motor. It's been very difficult to learn on. I actually regret my purchase. As a milienial I have no experience with this technology. So it's hard for me to troubleshoot something I never grew up around.
My word of advice. Stay away from carbs and vintage bikes till your ready. Get something you can ride on everyday without struggling. Really learn how to ride. That's what's most inportant