Read Austin (1961):
This was first published in Austin’s Philosophical Papers, a collection of his work published shortly after his unexpected death from lung cancer, at the age of 48, in 1960. It is a lightly edited transcript of a lecture he gave on the topic on the BBC in 1956. I have not been able to find the original audio of that lecture. The Harvard Philosophy Department has posted the audio from a talk on the subject that Austin gave at the University of Gothenberg, Sweden, in 1959, if you are curious.
I also want you to read a short selection from Lecture VIII of Austin (1962). It amounts to about 12 pages—I’ve crossed out the paragraphs that you are free to skip. This is from a series of lectures he gave in 1955. In this short selection, he makes a distinction between locutionary, illocutionary, and perlocutionary acts. (In the crossed out sections, he further subdivides locutionary acts into three kinds—it is interesting, and connects back to Frege!)