pacman is used on Arch. Some people prefer Arch ,
but there is a reason we recommend Raspbian instead.
I recommend you to read
Install synaptic or aptitude and browse around ...
• Don't like the board ? Missing features ? Change to the prosilver theme ! You can find it in your settings.
• Don't like to search the forum BEFORE posting 'cos it's useless ? Try googling : yoursearchtermshere site:raspberrypi.org