Obtain professional training as an ESL teacher. Participate in a "Teach English as a Foreign Language" (TEFL) course online, or alternatively train as teacher at a university.
Develop your understanding of teaching techniques by reviewing a variety of resources available online. Use the Resource Center at tesol.com or log onto teachingenglish.org.uk for specific teaching advice. For example, the article "how to teach" grammar explains that you need to use a variety of written exercises to help students learn the context of words.
Make a lesson plan before beginning to teach so that you have set objectives for each class. Plan to have students reciting the alphabet, counting to 100 or being able to discuss hobbies by a certain date. These can be written into a lesson schedule and supported by worksheets, which are available for free from tefl.net.
Print worksheets to support your lesson plans. A worksheet is a written exercise for students to complete in order to practice reading, writing or grammar. Englishclub.com has a number of free sheets available for your use including questions for students to answer about different tenses, lists of vocabulary to learn and pronunciation exercises.
Develop the student's ability to read English by choosing students to read out loud. For example, instead of explaining how to complete a worksheet include the instructions at the top of the print out. Then, ask a student to read it to the class. Make sure the other students listen, and correct the reader's pronunciation if he or she makes mistakes.
Play games to teach the students new vocabulary. Set up a game of Bingo to educate students about numbers. Get one student to select the numbers and read them out to the class, while the others try and mark them off a grid.
Use CDs, radio or videos to stimulate the students and give variety to the English classes. For example, get a CD with nursery rhymes. Write down the words of a song, then teach the song to your students to educate them. Use pictures to describe the meanings of words.
Get the students to speak to each other in English. Divide the class into pairs or small groups and give them a topic to be discussed. Walk around the class and listen to each of the students speak, while correcting mistakes and giving praise to good use of language.
Challenge the students by giving them a translation exercise to complete. This focuses their attention on using grammar correctly. Hand out an excerpt from a newspaper article or book, then ask the students to translate it from English into their native language, or vice versa.