Hi Anand,
For license issue you can send an email to licensing@cisco.com and once it is done for initial configuration and ASDM access setup, you can follow the below video and document link:
https://www.youtube.com/watch?v=ub1ILUzBn8A (Basic ASA setup)
https://www.youtube.com/watch?v=0mRNxQbGa60 (ASDM setup)
http://www.cisco.com/c/en/us/td/docs/security/asa/quick_start/5506X/5506x-quick-start.html
Rate if it helps.
Thanks,
Ankita