Might not want to advertise the fact you'll be working without the correct visa. If you're looking for a teaching role you need a degree as a minimum with TEFL or similar qualifications. Depending on what country you're from there are loads of options online and in UK definitely tons available face to face to ensure you are a competent and confident teacher. If you're serious about teaching and not a qualified teacher, I'd suggest getting as much experience and training before you actually start to attempt children or adults. Well paid jobs are given if you're suitably qualified at a high level in international schools 🙏🏽
If you have no teaching experience, international schools will be extremely tough. You will / should need a TEFL, your degree cert and transcripts and some experience of working with children.
Money wise will vary a lot, but it's not usually well paid - completely manageable don't get me wrong and some schools do pay well, but usually to actual trained, experience and qualified teachers. I taught pre-K through to high school, in an international school, did extra tutoring, planned the majority of the curriculum for English, so good work is out there for qualified people 🙏🏽