The most important thing to do to increase your SWTOR credits is by completing missions, of course especially the main ones for your class. Completing the missions will earn you enough credits, and that credits will be your own capital for the more advance technique when increasing you SWTOR credits. Most players spend their SWTOR credits on gears, med packs, stim packs or other items that is not really important or useless. You DON’T need to spend that much. Just take every mission as you can and while you’re at it, take also the bonus mission reward. Leveling from up to 50 is enough without buying much; this will make you start on Galactic Market Trading Empire.
Source:
