Things that we are going to start needing that will cost credits include...
Better Armor
Attachments for Armor
Power Ups (PuPs)
Better Weapons
Food/Drink

Many suggestions point to doing World Boss with the rest of the Server, it pays out about 3,000,000 credits per participant for the whole activity.

Here is a guide to some additional sources. In this guide we are going to Start at Section 2. We are heading to Mustafar.
[EMBED content="thread-840"]https://www.swgevolve.com/index.php?threads/840/[/EMBED]

We are going to return to Foreman Chivos, you may recall he provided the quest that got us to level 90.
/way mustafar 333 209 -1126 Foreman Chivos;

After chatting with him you should now have the quest "Salvage Or Die", you can find it in your Journal by hitting "J".

Downed Capital Ship is located on the center island of the map, if you don't have the Desert Skiff it may be difficult to reach.
You can barely cross with a Flash Speeder between the following waypoints, GET RUNNING SPEED WITH FLASH SPEEDER.
/way mustafar -57 3 -336 Lava Crossing (Central Island South);
/way mustafar -54 20 -219 Lava Crossing (Central Island North);

Now that we are on the central island head to where you get the first Power Rod from the Leader.
/way mustafar 192 118 108 Salvage Bandit Chief (Leader);

Kill him and you should get the first Control Rod.

Last 3 are located inside Power Rod Core Housing
/way mustafar 146 127 104 Power Rod 1;
/way mustafar 139 162 259 Power Rod 2;
/way mustafar 137 246 660 Power Rod 3;

Once you have all the Rods return to Foreman Chivos
Fastest way back is to use your Call for Pickup (ITV).

Foreman Chivos will send you to talk with Milo Mensix
/way mustafar 301 218 -1224 Milo Mensix;

Milo Mensix will give you the quest "The Downed Ship", you will need to travel once more to the ship wreckage.

We need to find the working Terminal located in the cockpit of the downed ship.
/way mustafar 260 101 24 Working Terminal;

But its not fully operational we now need a Circuit Board.
/way 210 145 287 A Destroyed Terminal (Circuit Board);

Still didn't find all the items you need time to kill Salvage Bandits around the wreckage.
Return to the Working Terminal once you have all the pieces.
If you still get no response try and communicate with the Working Terminal again.
Have a conversation with a murderous AI named HK-47.

The AI now will send you to the Kubaza Beetle Cavern to complete the mission "The Transfer of the AI".
/way mustafar -723 157 506 Kubaza Beetle Cavern (Transfer of the AI);

Enter the bunker door to proceed to your first heroic.

Here is a guide to how I complete this heroic encounter.
[EMBED content="thread-1822"]https://www.swgevolve.com/index.php?threads/1822/[/EMBED]

Now you should have 100,000 credits and 2 Mustafar Token of Heroism.

We now are going to skip a bunch of missions and get on a fast track of doing soloable Heroic encounters.
Visit the Mustafar Rewards Vendor
/way mustafar 392 230 -1340 (Mustafar Rewards Vendor);

Purchase the Scroll of Knowledge (Koseyet Mining Camp), and Scroll of Knowledge (Volcano Crater).
Use the scrolls in your inventory, this will unlock Droid Army Heroic Encounter, and the final battle with HK-47 in the Volcano Crater.