There is a lot of studying that must be done to become a teacher. Usually courses last between 3- 4 years and you can chose to specialise in one area such as Maths or English.
When you qualify as a teacher you have the choice as to whether to go into a permanent position or to go in to supply teaching. There are advantages and disadvantages of both and it is a personal choice as to which is right for you. As a supply teacher, you may find that you are sent to cover teachers at a different school every day or you may be remain in the same school for a number of weeks on a supply basis. Supply teaching can be a very rewarding job and have great perks. If you have qualified as a teacher and looking for work quickly or if you have been employed as a full time teacher and are looking for something different then many people recommend trying supply teaching.
The pay for a supply teacher is generally very good. You will often find that you can possibly work only 3 or 4 days a week to make your salary up to that of what you would have earned in a permanent position as the daily rate of pay is much higher for supply work. If you find your current teaching job stressful, boring or just fancy a change, supply teaching may be just the break you need allowing you to work with a variety of pupils and less responsibilities.