You should use first, second, and third to show textual enumerations in your writing. Many authorities prefer first, not firstly, even when the remaining items or points are introduced with secondly and thirdly.
Example: First, through practice you will develop a better style. Second, your readers will appreciate your efforts. And third, your boss will give you a raise.
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firstly, secondly, thirdly
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"firstly, secondly, thirdly." Grammar.com. STANDS4 LLC, 2021. Web. 26 Jan. 2021. <https://www.grammar.com/firstly-secondly-thirdly>.