Need help with MBP 2015

I have a MBP 2015 I got from my sisters husband from an old company he used to own. But the laptop is stuck with a MDM and 0 possible way to remove it by the “company”. I’ve been using win 10 this whole time just to get by because when I boot into Mac OS now I get stuck with a popup. It’s been nearly a year now of this so I’m not even sure what version my MacBook is running with open core but I’m willing to wipe everything as nothing is on there worth keeping.

My goal is to duel boot between win 11 and Mac OS. My issue right now is my computer is a mess and I’m trying to start everything from scratch square one as I know there are ways with commands and programs to remove a MDM but I couldn’t even begin to start as my system is a mess.

Can anyone guide me on what to do to - reset everything back to factory default - maybe remove MDM - use OCLP to run newer (doesn’t need to be latest) software - run win11 with bootcamp (I kept getting stuck upgrading win10 to win11 as I need Mac OS to use the programs from all the tutorials I found. It’s an early 2015 MBP 13inch with the i7 8gb ram.

I’m okay if i can’t remove the MDM but In the past I could use the Mac after resetting to factory for a few weeks before it stops letting me use it so that’s how I got open core and then windows later.

Really just need advice guide help etc on what I’m doing as it’s been a solid minute since I messed around with it.

I don’t own a “laptop” for daily use besides this and an old MBAIR 2014 (garbage) so I hope I can get this with at least Win11 if not just Mac OS working.