Hi hadi,
> So, would you please let me know what should i expect after inserting the tails dvd
> into my computer, and restarting my system to boot the CD?
1. wait for the OS to boot (1-5 minutes)
2. press Enter to get through the greeter
3. GNOME comes up
4. Enable accessibility features you need:
https://tails.boum.org/doc/first_steps/accessibility/
Thanks for testing, please let us know if you encounter any issue :)
Cheers!