This has to be your highest grossing mission with this particular guide from aoaltwar's blog

First of all, you will have to have a lots of Credits, in the first place, when you don’t have to spare swtor credits , just target other described activities in the meantime. Then you have to fully familiarize yourself with the Network; memorize the values, identify the most well liked, and the majority wanted items, be able to spot occasions, and also to avoid bad deals. After all these steps, purchase items posted to get a price below their real value, and repost them to ensure a profit. The most important thing in most this is patience. Don’t rush your decisions; if the items are not selling quickly, don't repost them for the lower price immediately, just wait and analyze, there's a good chance that they can sell eventually.

If that you are selling items stackwise like mats for example, check both; the smallest price per stack and per unit check here. If the cheapest items by unit price are typical tied up in large stacks, list smaller stacks at the higher unit price. Your aim should be to have your item either with the minimum unit price, or the minimum stack price, therefore it is easily found.Only buy circumstances to resell in the event the credit gain isn’t likely to be negligible. You can double your cash buying items for 100 credits and reselling them for 200, but with no efficiency.

Mission Discovery: Treasure Hunting
This may be the highest selling mission you can find (if you do not sell the Underworld Trading missions, which I don't recommend doing). You can get any where from 17 to 23k per mission along with perhaps sometimes even more depending on how much popular they are in your server.

Mission Discovery: Underworld TradingMission Discovery: Underworld Trading
This is normally the highest grossing mission using this guide, it will give you every single item you want to sell from Underworld Trading. I strongly suggest learning this mission and running it when you will get additional from doing the work this way than you'll from selling it. On the same note, whenever you go to the Auction House you may notice this mission listed for less than 10k (sometimes people stick them up for his or her base cost of 4k!!) buy it out and then use it immediately.

Mission Discovery: Underworld TradingMission Discovery: Underworld Trading
This has to be your highest grossing mission using this type of guide, it offers you every single item you may want want to sell from Underworld Trading. I can't help but recommend learning this mission and running it as you will get considerably more from performing it this way than you should from selling it. On the same note swtor guide, anytime you go to the Auction House you may notice this mission listed for just 10k (sometimes people place them up for his or her base valuation on 4k!!) buy it out and employ it immediately.