There are heaps of information for ALTs. I've collected many of them here.
For a broad overview of the job, see Planet Eigo, ALT Handbook from British Council in cooperation with MEXT, ALTTO and the spinoff webinar ALT Agora.
For labor issues The Foreign Workers' Handbook 2023 edition and Working Conditions Handbook
Private high school and school board positions appear in JALT job listings and Ohayo Sensei.
That'll be 4500 yen, ma'am/sir.
by SeaEuphoric7319