Get the cage. Make sure not to go too big to start, easiest mistake.
I would recommend a kink3d cobra knock off for around $20 (AliExpress) as a good starting point because they fit well, are light (in plastic), come in black or pink, and include a variety of rings so you can experiment with size. I wear the baby/nub size and it's very comfy!
This would be very welcome on !censored@lemmynsfw.com