Translation of Lastkahn

It actually happened to my cousin's youngest kid. He was repeatedly warned not to smoke in the courtyard of the school. At the end he found himself expelled from the school. It could have been an interesting experience for him though.
My name is Wolfgang, and I am interested to build my Spanish vocabulary. Maybe we can practice together. How long have you learned Spanish? I have been learning for a few years with books.
And how long will you be there? When will you come back to Venezuela? Now, I'm learning German grammar and I am doing my homework. Super boring, and it took me too much time in total.