How can I buy Metro Coins?

I'm interested in purchasing Metro Coins, but I'm not sure how to go about it. Can you walk me through the process? Do I need to set up a special account or use a specific exchange? Are there any fees involved, and if so, how much can I expect to pay? Also, are there any security measures I should be aware of when making the transaction? I want to make sure I'm doing this safely and efficiently, so any guidance you can provide would be greatly appreciated.