Heres a the way I always make money I usually make 100k within the hour if not more
You must be higher level usually 80+ to get these quest
For Imperials go to Dantooine Imperial Outpost
Rebels Go to the Rebellion outpost on Rori
Once you arrive start grabbing quest from the terminal they usually are 9k or 10k
Also look for the shortest distance ones usually you will only have to kill 2 or 3 npcs and then the banner in the ground
The reason you should choose these two places for leveling up faction and gaining money is because they are small and easy to get out of quickly
Good Luck with your Grinding if your into that kinda thing!