This is pretty much your answer, but to add a bit to it, if you go to the GTN (Auction House) on Fleet go to Armour and click Adaptive armour.
In each one basically just make it list from highest to cheapest, as you can easily pick up a customizable piece of gear for 1000 credits, which is basically nothing. Also, for a similar price you can go to comm equipment vendors and pick up a not too bad looking piece of gear for the same amount of comms but already socketed, same with Weapons.
With the amount of Comms you get, you can easily upgrade every 8 or so levels as Lesane said, since you now get quite a few Comms and Comm prices for Armorings and such have been reduced to 25% of the old cost.
The gear you get may not look the best being that cheap, but with the outfitting system you can just overwrite it with the pieces you pick up from leveling if need be.
Also, if you are training crew skills as you level, take Slicing and a Gathering Skill, Slicing will give you a nice little supplement of Cash, and low level crew Skill materials sell for fairly good prices for the 25-50 zones.
I've been able to use these methods to level characters on new Servers that did not have any credits and a fresh start so it is very doable.