First steps

su
apt install sudo gksu
adduser <seuuser> sudo
sudo nano /etc/apt/sources.list

deb http://ftp.br.debian.org/debian jessie main contrib non-free
deb-src http://ftp.br.debian.org/debian jessie main contrib non-free

deb http://ftp.br.debian.org/debian jessie-updates main contrib non-free
deb-src http://ftp.br.debian.org/debian jessie-updates main contrib non-free

deb http://security.debian.org/ jessie/updates main contrib non-free
deb-src http://security.debian.org/ jessie/updates main contrib non-free

deb http://http.debian.net/debian jessie-backports main contrib
deb ftp://ftp.deb-multimedia.org jessie main non-free

sudo apt-get update
sudo apt full-upgrade
sudo apt-get install deb-multimedia-keyring
sudo apt install gstreamer0.10-fluendo-mp3 gstreamer0.10-ffmpeg ffmpeg sox twolame vorbis-tools lame faad gstreamer0.10-plugins-bad
sudo dpkg --add-architecture i386
sudo apt-get install oracle-java8-installer