How to buy paal AI MetaMask?

Excuse me, I'm new to the world of cryptocurrency and I'm particularly interested in purchasing Paal AI tokens using MetaMask. Could you please guide me through the process step-by-step? I'd like to know if there are any prerequisites I need to fulfill before getting started, such as having a specific cryptocurrency to exchange for Paal AI, or if there's a particular marketplace or exchange where I can find these tokens. Additionally, could you explain the security measures I should take while using MetaMask to ensure the safety of my funds and personal information? I appreciate your help in navigating this potentially complex process.