Introductions discussion

Hi everyone been lurking for a few weeks been interested in chastity for a while. I recently broached the subject with my gf and she like the idea of controlling when I orgasm which is all I really want don’t want to be cuckold or sissy it’s just not for me. Im looking for advice on what device is best for use from a few days to a couple months at most? Also I’ve got a stainless steel device I got from amazon rather cheaply to just see if I liked it but few issues with it think the ring is too small so can’t wear too long most is 4 hours so far. Any advice would be great thanks