Studying in Estonia and overall life in Tallinn

Hi r/Eesti, I'm going to study in Tallinn next year, and I was wandering, what are the basic info's I should learn before going to Tallinn. How is life in general, places to live, transport system and all that. Are all classes held in eesti, or some in english for exchange studends?

Another questions I have is, is it hard to find something like a part-time job, or bar tending during weekends? How hard is to find vegetarian supplies in Tallinn ( stores or supermarkets) ?

Thank you so much guys