Dude! Just buy any Fairly new LO206 kart and you’ll be happy with it, drive it for a season and re sell it if you want something better. You’ll be just fine. Just head out to the track and do a bunch of seat time, and practice, That’s all you really need for now, just to get your foot in the door. We all rotate to better quality karts/chassis gradually and eventually.
Just do it, you’ll love it, but just go out there and get it done!