Caudata.org is the way to go. I have raised up a larval Ambystoma maculatum successfully. I suppose it's all the same thing really.
I kept my larva in a small aquarium with a air powered filter and no substrate. I performed frequent water changes and maintained a pH around 6.8. I fed it live daphnia and after that was no longer available, I fed it frozen/thawed blood worm. I also put an inverted styroform in the tank for it to climb out on once it morphed. That's pretty much it.