If you never handle even RXZ/FZ/RR, better go for 250CC bikes like R25 or the CBR250 to learn riding.

600CC, if your skills are noob. if lucky then few scratches and few broken bones, unlucky direct die. Big bikes corner differently from small bikes, wrong technique surely you can't turn and crash into something (overshoot).

Look at news, so many big bikers die even if they're rich. Follow friends to race on Karak but without the skills.