The best guide for SWTOR is to use a bot by www.swtorbots.com

but for now heres a guide to get credits in SWTOR

To start with lets talk about crafting. Swtor has a great crafting and its worth getting in early and learning a craft that is going to allow you to make tons of extra credits. Crew skills in Swtor are excellent for this since you can make your crew do the work whilst you enjoy leveling on your character. Crafts to consider taking would be Artifice and Biochem. Artifices being able to craft weapon upgrades and color crystals are with no doubt going to be having a lot of customers whilst Biochem can make medkits and potions which everyone needs and uses a lot, The Biochems consumable products are great sellers and you will struggle to make enough items to keep up with the Demand.
Gathering Skills can be very useful, One of which is Slicing. This is a excellent skill to have since you can open Computer Terminals, Lockboxes etc and most of which will contain either valuable items or just credits. Other gathering skills will give you materials to craft you own goods but also provide other crafters with the stuff they need to make their gear.
The GTN this is one of the best methods since many players have no real idea how to use it for making loads of credits. They just use it to get what they need and sell what they don’t. You can take advantage of this straight away since they are willing to pay a lot of money for stuff they need and sell stuff they don’t very cheap. You just need to become the middle man and pick at the cheap items and sell them on for profits sometimes large profits. To learn the best GTN tricks and techniques I recommend Wealthy Hutts.
Be careful and responsible with your credits. Yeah this is a basic one but the amount of players I see waste a lot of credits for nothing scares me. People buy expensive gear and items that they do not need, do not need for very long or can just get cheaper elsewhere. These type of players make clever players very rich, try not to be one of them and always consider your options before you spend your credits.
Quest like a mad man! that’s right questing in Swtor is not a bad way to make credits just do as many as you can in the sames areas and you will soon have a good amount of credits to allow you to start crafting or trading on the GTN. Quests will also give you reward items which you would otherwise have to buy so that will save you credits also.
I hope these tips give you some idea of what you need to do to start making credits in Swtor. The real easy way to make credits in Swtor is by using the GTN to trade, But you need to know what you are doing. That’s why I recommend Wealthy Hutts since they have some excellent methods.

I only to say thanks