I have no teaching experince! I have no idea how to get my students motivated or how to create lesson plan about food for 40 mintues

.The key sentences are, 'What did you eat?', 'Did you eat~~~?', 'I ate ~~.'
Students should use past forms.They will use figs, fish, beans, bananas, peas, peppers...

I need help !!! Please someone give me some advice. I feel like a failure. Thank you