Disclaimer: I love bowling on sport patterns! Therefore take anything else I say with a grain of salt.
Do not wait until you're "good enough". Join a sport league as soon as you can. If you wait until your average is 200+ the shock of realizing how lousy you really are will be too much and your ego will be torn to shreds and left to be vacuumed up off the concourse carpet.
When I tried the sport league, I was making the transition from conventional grip/rubber to fingertip grip/reactive resin. I had been averaging about 170 throwing conventional right-handed. I had just finished the winter season bowling left handed due to an injury. In the summer sport league I averaged 174 right handed so my ego came through unscathed!
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