Hi uvsb,
It depends on whether you would like to speak "German" German or "Austrian" German.
In Austria we use the informal "Servus (mach es gut)", "Baba" oder "Griaß di" and the formal "Auf Wiedersehen". Unfortunately, however, "Tschüss" is increasinglingly replacing the good old Austrian forms in Austria, too.
Kind regards,
Georg