Being new to this, you will in due time experiment with everything. Get used to it. lots of good info in different threads. In your 50, typically the .490 and .495 are normal fits. Less felt recoil for sure.
As for accessories, I will bet most here have extras of everything.... me included. So before buying new.... ask here. I have a bunch of extras too.
If you are getting into target shooting, you will find the curiosity tugging at you to try both round ball and conicals.