In terms of languages, everyone gets basic and their species language, as well as an additional language for every bonus point on their intelligence rating (so between 1 and 4 normally). For bonus languages, you can select other species languages, or one of the 'trade' languages such as bocce and the jawa trade language. Around the Outer Rim, and in dealing with more shady elements, Huttese is also effectively a trade language. If you pick Binary, you can understand droid communications (artoos beeps and whistles for example). Gamoreans and Wookies can only speak their own languages, but can understand others just fine.