Rage is a Sith Warrior discipline. Did you mean Hatred or Deception? Depends what you want want out of the profession. I'm no expert on money making so I'll leave that to someone else, but generally the consensus if this is your first character is to go with 2-3 gathering crew skills.
If you want to make your own armor, synthweaving (if you want to look like a force user) or armormech (to look like non-force user), artifice to make lightsabers and color crystals. Biochem if you want to make stims and adrenals and medpacks and such. Or cyber Tech for implants ear pieces, etc etc.
Multiple crew skills make augments, different types depending on the crew skill.
From what I've read, artifice and cyber Tech are the most profitable.
Hope I helped you come to a decision a little bit better! O/