Need some advice for crptocurrency stats software development

Hello I am a cryptocurrency enthusiast and a computer engineering student. I have some knowledge in Android development(hence Java), C++, python. I want to make a LIVE market stats(market depth and live price etc) software and eventually into an Android app. I hope I can get a some advice from you guys. No competition, the software is for myself! Here is what I would like to know
1. What CS knowledge do I need? Like what language should I focus on studying.
2. How to get the LIVE information from the exchange websites. Should I contact them or there are other ways.
Any additional advice would be very much appreciated!
Thank you
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