IDPA requires the calibre to be 9mm P or larger.
A local club might well let you shoot your CZ52 just to get you started but you could not take it to a sanctioned match like a state championship.
Ask at the club where you will be shooting.
Those $15 nylon holsters are really cheap and nasty but if that is what you have, bring it along, there was one in use at the shoot I went to last Saturday.
Be CAREFUL those things are not really designed for safe fast draws. Take your time and get the gun out and settled in your hand with no rush.