If this is first game, maybe try defensive ones, especially energy resistance. Lightside or darkside character? If it's the first, go for powers like Force Valour and Burst of Speed (slight boon to defence). Stun droid helps against those probes that like to repair damaged mining droids on Peragus if not taken down first. And not forgetting basic power like force push, which works on most droid and non-droid enemies. DS powers that help would be Shock (works on both droids and humans) as well as Fear (only on humans).
Either way, getting force redirection helps against blaster attacks.