In "San Andreas - Business and Trading" section forum, you can find the stickied topics for the 3 current driving schools - LSDS, AVDS and SFDS. Each of them has an application to join as a staff member, fill it up and post it, and that should be it. Just be careful to read the topics completely, as offers and requirements may vary between the schools, and you should pick what fits you the most.
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