1. This is the easiest, study a CELTA/TESOL course, which takes about 1 month, and become an English as a second/foreign language teacher. This qualification is sometimes not enough on it’s own, in certain countries, so you may also need a bachelor’s degree (in any field).

2. This one is medium, have a look at becoming a Montessori teacher at:

http://unitedmontessori.com/

This course takes a year to complete, but can be done in your schedule, as it’s a distance course.

3. The longest, study for your B. Ed. That takes three years, then you may also need further qualifications depending on the age of students, level and subject(s) you wish to teach.

Each of these has it’s own pros and cons. ESL/EFL is good if you want to travel, but not if you intend to stay or live in an English speaking country.

Montessori is quite a specialist job and market. You would only find work in a Montessori school, but there are quite a few around.

The ‘real’ teacher option can be very emotionally rewarding, but it is a lot of hard work to get a job in a field that doesn’t pay well and is unbelievably stressful. If you are considering this last option, have a really good re-think about what you can see yourself spending your working career as (i.e. could you survive the stress and frustration of being a teacher?).

I wish you all the best with whatever you choose, but choose wisely!