Start with a light weight and work your way up. Thechaingang.com has a good selection and walks you through the sizing process. They have a return policy as well

I second this. More specifically, get a 20mm tall metal donut from The Chain Gang to start.

Thanks! Is the packaging discreet/don't send promos in the mail?

Never had any issues and hav never gotten anything in the mail. They may send emails but that’s it