Chastity and orgasm denial discussion

Hello, apologies if I posted in the wrong section as I am new here. My girlfriend and I are seeking guidance on where to begin incorporating male chastity more deeply into our relationship. We have experimented with it slightly before, keeping me locked for up to 8 days at a time. We are just wondering about advice regarding start periods, teases, whether we should establish some kind of agreement or leave it entirely to my keyholder’s discretion etc. When I am locked, we use the CB6000s. This is done outside of work due to professional reasons. Thank you for any replies.