Trying roller derby has been a bucket list item for me. I signed up for a camp but I need to buy all the gear outright. Any advice/suggestions?

When I was a kid in the 00's, I remember watching an episode of some mtv tv show that featured two sisters who were on a roller derby team. I thought they were so cool! Trying it out has been in the back of my mind ever since, and I'm grateful that I have the opportunity to try.

Camp starts in a week. I'm betting my best course of action is purchasing some skates ASAP for practice. I'm not above buying used for this at all, but I'm not 100% on what I should be looking for. I'm also curious about the general census on how much someone should ball out on elbow pads, helmets, etc in the beginning. Can anyone suggest a decent entry level option?

Thank you!