Im coming from linux Mint. I installed Ubuntu 13.04 but the first thing i noticed is that when I tried to add the launcher of terminal or other application it is not adding that launcher to Global Menu.
Does any know how to do this
That is not possible. That's what the launcher (The "panel" on the left hand side) is for.
Currently you don't have a lot of options to customize Unity, however if you do want to know what you can do, check out the "Unity Tweak Tool" which from 13.04 is available as a free download in the Ubuntu software center.
If you want to do it from terminal then you can do it from