I think immigrants in California have to learn English, work and rent a house, but California has no friends. I want to ask a friend to recommend it for me. Thank you!

That depends on what school you plan to go to. Generally speaking, if you have chosen a school, you can find the corresponding school forum on Baidu or Google, which will contain information such as renting, sharing and part-time job. By the way, you can exchange information about relevant schools there. I believe you have chosen your major. I wish you all the best first.