I am one of the only Chinese people in a mainly urdu-speaking community of brothers and sisters from India, Pakistan, and Iran. Is it obligatory upon me to gain knowledge at the hawza? And if so, how should I proceed given that I am the only child of my recently-widowed Christian mother and that I am planning on getting married in January 2019?

You can study islam online or where you are
For eg ehawza.com will send you hundreds of lectures.
You need to look after your mother and must not neglect her and must attend to her needs. This is important