Beginning FLAT is always pain stacking task, but here I tried to provide Roadmap to Getting you started. Happy Learning!!
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Can start with this long lecture: https://youtu.be/14RLvkzbHFc
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If you need something more specific: Get Michael Sipser on your screen
https://www.youtube.com/watch?v=9syvZr-9xwk&list=PLUl4u3cNGP60_JNv2MmK3wkOt9syvfQWY -
I have provided the Problem 200-Set to get you going It will help you Clear Doubts.