You could start with name tags.
Bring different colours of construction paper.
Greet your students one by one. Ask them to come to the board and choose a colour for their name tag. "Hi! My name is Dan. What is your name? What colour do you prefer: red, yellow, blue, green...?"
Ask students to write their name on the tag in big letters. If they have more time, you can ask them to draw their favourite animal, food, sport... on the tag.
When they come to the classroom, ask them to take out their name tag and place it on the desk. You �ll quickly learn their names.