You can offer the food pretty much immediately if you'd like. I would suggest a Live Small or Mediam Rat. Have you sexed them or had them sexed yet?
I would suggest keeping them in 32qt or 41qt sterilite containers (about $6-8 respectively at Target) with Newspaper as a substrate and a dog food bowl for water. Wouldn't hurt to put a little extra newspaper in there as well to give them something to hide under if they want.
You can either build/purchase a rheostat or purchase a thermostat and use a heat pad per container to keep them warm, a 55 Gallon tank won't hold heat for nothing and may also stress them out more.
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