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What model of MacBook do you have? and does that model have a built-in microphone?
If not, you will need to plug a microphone into the MacBook's microphone or 'sound input' jack... if your model of MacBook has one.
Let me know... and I will advise you further.
Good to hear that.
You will need to use an app such as the Voice Record or Voice Recorder app:
and that's about it, aside from your using the Volume control app (under Sound in the System Preferences, if not elsewhere too) to set the microphone level and a few tests first to make sure it is all OK.
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Recording on the phone is a different matter. You would most likely need additional equipment for that, period. Would you consider acquiring new equipment for the purpose of phone call recording?