How can I erase my macbook
I am told to hold command and R while MacBook is coming on and will go to recovery mode. Nothing happens. I think it is from 2012.
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Do you still have a running macOS on your Mac? What version? Check Apple Menu > About This Mac for info.
If yes, create a bootable USB stick with this https://support.apple.com/en-us/HT201372
Then turn your Mac on and hold Option key, choose the UBS installer and proceed.
Before formatting
Reset SMC https://support.apple.com/en-us/HT201295
Reset NVRAM https://support.apple.com/en-us/HT204063
Here's how to reinstall macOS on your Mac https://support.apple.com/en-us/HT204904
You can jump step 1 once you're already in Recovery Mode after booting from USB installer.
Make sure to backup your personal data to an external HD.