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Heavy Excel users and others may prefer an external mouse. This is probably a mouse from a Windows PC. You may find it not as attractive to have a Windows mouse with your new MacBook, but it is practical. You can also use a Mac-branded option like the Magic Mouse. The Magic Mouse has a Secondary Click option available in the System Preferences. When enabled, this allows you to right-click just like on any other mouse. . Plug that mouse into your USB on the Macbook or connect via Bluetooth, and you are good to go.
Decide if you want an external mouse. Get a mouse that has two buttons, or two-button capability. Connect the mouse