Online ESL teaching - how to get started?

I received this email this morning:

Hey Karenne!

Do you have any advice on how one gets started offering virtual ESL lessons?

Thanks!
Suzie

Before answering, I thought I'd turn it over to you as I can think of several ongoing training sessions she could participate in to get her skills up to speed and will be sending this link (courses at the bottom) - however I reckon she's also asking about finding students and keeping them actively learning, motivated and.... (me putting words into her email of course) probably how to do this in a way that also brings in a reasonable income.

So if you're a successful online English trainer (or even a company that deals with this sort of thing), whether it's via Skype, 2nd Life or any other platform - would you like to share with us your best tips, helpful links, book suggestions, good/bad experience and things to watch out for - so that we can become better informed?

Thanks muchly in advance!

Best,
Karenne