You want to go from PM to cysec?
You’re probably going to possibly take a pay cut. Security+ is probably the de facto entry level cert. ISC2 was giving away free vouchers to their new basic cybersecurity certification. Their CISSP is probably the standard management level certification.
But I’d let someone else chime in if they lead to SOC analyst jobs, blue/purple/red team type positions, or cybersecurity engineers.
You can use VMware workstation or Virtualbox to lab some concepts with Kali, Windows 11 Eval and Linux distros.