Recently I have been in a new class for approximately half a month. We are having online class now and will be back to school soon. As I used to be a quiet student, I would like to try to make friends in a humorous or active way, what can I do? What kind of jokes can I tell?

I am a tutor. I wanted to send a message to a student like - Just checking in. I could help you with various comp science/math subjects. Do let me know whenever you need any help. Is this appropriate? Any suggestions?