What are the requirements for joining a Hawza? Is knowledge of Arabic or Farsi necessary, or are there English-language Hawza programs available? What foundational knowledge is required to commence such studies?
Main source of Islamic knowledge is from Quran and Hadeeth and both are in Arabic. If you want to study and understand Islamic sources, you will need to understand Arabic to understand Quran and Hadeeth. You can join Hawza and start studying in English as beginner, then learn Arabic to continue. There are many Hawza classes in English and other languages but only for beginners who will definitely need to learn Arabic to go further in Islamic studies.
'Wassalam.