I searched all over youtube but could not find any video for beginners which covers the tool entirely.
I looked up on Youtube, this is what I could find: https://www.youtube.com/watch?v=H2VekKvnxbU
Its best to learn it from who is used to using it. The best learning comes from experience, in my humble opinion.
For more information you can follow Amibroker India, Amibroker Fanclub and Amibroker AFL groups in Facebook
(Legal NSE realtime data vendors for FNO and CDS)
You can check out the below tutorial series:
http://tradingtuitions.com/category/categories/amibroker/tutorials/