The ways i earn my money:

1. Harvesting for money. Even with just novice scout (0000) you can make pretty good money with this. Usualy harvesting can pay 50-75cpu (so harvesting 15k could make you millionaire ), mostly when harvesting wooly hide or herbivore meat. Sometimes the payment can even go upto 200cpu, but that would involve nuna's, im afraid :P.
   
2. Selling loot. Well personally i dont use this option too often, since i give away most loot to the guild, but sometimes it does pay well. One tip everyone should consider is talking to Hedon Istee in Mos Entha. This npc gives you a mission that will give you a scythe schematic (watch the krayt though :P) which you should be able to sell for around 700k if you find the right buyer.
   Ow. And fighting non-creature npcs can give you some nice money loot as well. Imps useally drop 100-400 credits a kill, NS even over 1k5 sometimes. You can also consider going to a special cave to get some loot (some are better than others) if you feel lucky, dont nerve it there, so dont do afk looting and give others a fair try as well. Findout what a looted item is really worth before selling it to your first offer.
   
3. Selling resources or rent lots. Everyone is able to place miners, so why not use your lots to make money with it? If you have enough money to buy miners, you should look into what for example archi's, weapon/armor-smiths and other professions need. Then place a miner on the best resources you can find (www.swgcraft.com).
   Yes, miners are expensive, especially BER13's, so a second option is to rent the lots to someone who uses them, and ask money for it. Probably you will first need to gain someones trust for this, since you get to own all the miners temporarely.
   
4. Make use of your profession. If you dont have only fighters professions, you will be able to make money out of your second profession. The one is more suitable for that then the other, but with most you should be able to buy you're daily bread (or brandy ). Ofcourse i cant go into details for every proffession here.
   
5. Mission grinding. Yes indeed. They nerved the solo groups, but you still are able to make a few 100k on a buff if you have a strong fighter profession. If you take one of your friends to in example dantooine you can both invite droids to your group. You should be able to get mokk missions now, and they pay about 18k/mission. Thus you will both receive 9k a mission, they are not hard for most master professions, so swoop - fight - swoop - fight - swoop etc, and you will get some decent money.
   
6. Dont try to lift other players. You might earn some money quickly but eventually it will turn against you. Also, try to keep your customers happy. If you sell your harvests to someone, try not to raise them too much against other possible buyers. If they are happy with your services, they will return to you!
   
7. Share info with your guild, sometimes you know that someone is looking for something, if you cant forfill their demands, try to think of a guildmember who can. If you do this, changes are big other guildmembers will do the same for you.
   Ow, and personaly, i think it is wrong to make money out of your own guild
   
8. (dont know a point 8 yet, if i come up with it sometime i will post it here)

Ow, and dont think im that rich, hehe. Personally i am satisfied as long as i have enough money to buy the basic stuff like brandy, so I dont make much money unless i will need it.