Verb conjugation of "expulsar" in Spanish

My wife an I have decided that as long as our children were small and would not have to go to school we need to take advantage of our freedom and travel as much as possible. Later this year we will go to Costa Rica.
I think it's a good idea to fly to Antigua to a language school. I feel more confident with the grammar in Spanish. Perhaps it would be better if the school would arrange the accommodation.
My daughter lives in London and she is divorced and works as a gynecologist. She has no children. My son is married to a Spanish lady, so I want to learn Spanish. Let us help one another.