To have the students know your (the ALT's) basic stats
Write an easy self introduction, it should be between three and five minutes. This time includes repetition of key words and important points.
Start your first lesson by telling the students that you will be doing a self introduction. Tell them that when you are done, they will put their hands up and announce what they understood. Ask the HRT to translate your instructions.
Give your self introduction repeating two or three times the important nouns. These include but are not limited to: home city/country, family members, hobbies, things you like, etc.
The students should be able to understand some words. After your introduction encourage them to remember as many things as possible.
Next, go through the self intro again having the HRT translate sentence by sentence.
Finally, open the floor to questions – they will be curious about you.