How to buy Kujira MetaMask?

I'm curious about the process of purchasing Kujira tokens using MetaMask. Could you please walk me through the steps, from setting up a MetaMask wallet to actually making the purchase? I'm particularly interested in understanding how to ensure the security of my transaction and wallet. Additionally, are there any fees associated with the purchase, and if so, how are they calculated? I'd appreciate a clear and concise explanation that takes into account the potential challenges or obstacles I might encounter along the way.