"Must haves" for first time mom!?

Alright ladies...I'm 22, married for 2years and we're expecting our first baby. I'm also going back to school to finish my degree in education (army wife, so we've moved and it's been hard to keep up with school) anyways, I want a list of what ya'll think are must-haves for a 'young mom on the go'. My baby shower is coming up in a few weeks and I'm trying to refine my registry to make sure I have more of what I need rather than what's cute and adorable (so much cute little girl things out there!)