Hello Guest 'First of all' can be used without a 'Second' if a following passage has the sense of 'Then', 'Next', 'Later', etc. 'First of all I took off my hat. Then I took off my coat.
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OttoJBut when I have only two points to make, can I still use FIRST OF ALL?Yes, it is common enough. In that phrase, 'of all' is an intensifier.