Sugar Gliders Noise Meaning?

We have three sugar gliders yesterday and we did research on how to raise them. We know they eat fruit, like puzzles, active at night but I can't find anything about what the noises they make mean. They make this chirping, growling noise, and I'm not sure if it means they are mad or scared or what. Also, when I game them a bit of strawberry they made a more purring sound, is that good?