My first friend on italki

I am so glad to make friends with Bob. He is my first friend on italki, and he is very funny. I was so sorry to end the conversation with him because I had a little thing to do. And now, I am free, but he may be sleeping because time is too late for him.
I have classes when at 15:00pm. So, I think that I should go to sleep too.
(I sincerely welcome you to correct my composition. Thank you so much.)

To my first friend on italki

I am so glad to be friend with Bob who is the first friend I met on italki. He is a funny person. It was so pity to end the conversation with him because I had got little thing. And when I am free now he probably sleeping already because of the different time zone.
I will have classes later at 15:00pm so that I should go to have a rest.
(Sorry I am not English speak but correcting your sentences)