Starting teaching

Try typing 'Tesla books' in Go Ogle.  Or you could try the long-winded way...?

'Books for Teaching English As a Second Language'

But do you really need books?   Even the 'online colleges'  simply use sub-titled movies
(which can be cartoons, classics or even horror!)   Point out they are learning accent, context, body language (and that languages are fun to learn!)   Other methods include simple picture books  a.k.a. children's...  or draw a face, car, house (etc) on a blackboard and point and write.   Look at curriculums and vocabulary, then trash them and invent your own.

  Draw up your own lesson plans.   Use humour.   keep it interesting or they won't bother.

Let me say it again.  Interesting=Attention=Remembering.    Too much of the same stuff is boring.   Vary variety and intensity.   Keep it light.   Learn from your mistakes.

There is no mystery.   Just application.   Use higher levels of fluency to delegate monitors.

Reward their interest and rewards return to you.