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Hi @Abhinav, not having initial finance knowledge is ok, the point of CFA is to put everyone on the same page. As long as you put the time to learn and study the syllabus, with plenty of practice questions, you should do fine.
Starting your studies now for Dec would be sufficient time. In terms of your other commitments, you need to plan and schedule them in, try the technique in this post to help set up a sustainable study plan, even with your commitments.
I did the CFA a few years ago with a hectic 12+ hours full time job, and only studied full time on weekends (and basically had no life). So assess your study schedule along with your other commitments and potential internship to see if you have time to hit 300+ hours of solid studying, then you will have your answer.
I hope this helps, let me know if you have further questions @Abhinav.